DailyMed Label: Myobloc

DailyMed Label: Myobloc

2023

DailyMed Prescription

Myobloc

rimabotulinumtoxinB

Solstice Neurosciences, LLC

NDC: 10454-710

NDC: 10454-711

NDC: 10454-712

NDC: 10454-710

NDC: 10454-711

NDC: 10454-712

NDC: 10454-710

NDC: 10454-711

NDC: 10454-712

NDC: 10454-710

NDC: 10454-711

NDC: 10454-712

NDC: 10454-710

NDC: 10454-711

NDC: 10454-712

NDC: 10454-710

NDC: 10454-711

NDC: 10454-712

NDC: 10454-710

NDC: 10454-711

NDC: 10454-712

NDC: 10454-710

NDC: 10454-711

NDC: 10454-712

NDC: 10454-710

NDC: 10454-711

NDC: 10454-712

NDC: 10454-710

NDC: 10454-710

NDC: 10454-711

NDC: 10454-711

NDC: 10454-712

NDC: 10454-712

RimabotulinumtoxinB is an acetylcholine release inhibitor. RimabotulinumtoxinB is a 700 kDA botulinum toxin type B complex produced from fermentation of the bacterium Clostridium botulinum type B (Bean strain) and exists in noncovalent association with hemagglutinin and nonhemagglutinin proteins as a neurotoxin complex. The neurotoxin complex is recovered from the fermentation process and purified through a series of precipitation and chromatography steps. MYOBLOC (rimabotulinumtoxinB) injection is a sterile, preservative-free, clear and colorless to light-yellow solution in a single-dose vial for intramuscular or intraglandular use. Each vial contains 2,500 Units/0.5 mL; 5,000 units/mL; or 10,000 Units/2 mL of rimabotulinumtoxinB at a concentration of 5,000 Units/mL at approximately pH 5.6. Each 2,500 Units/0.5 mL vial of MYOBLOC contains 2,500 Units rimabotulinumtoxinB, 0.235 mg albumin human, 2.9 mg sodium chloride and 1.35 mg sodium succinate. Each 5,000 Units/mL vial of MYOBLOC contains 5,000 Units rimabotulinumtoxinB, 0.47 mg albumin human, 5.8 mg sodium chloride and 2.7 mg sodium succinate. Each 10,000 Units/2 mL vial of MYOBLOC contains 10,000 Units rimabotulinumtoxinB, 0.94 mg albumin human, 11.6 mg sodium chloride and 5.4 mg sodium succinate. One unit of MYOBLOC corresponds to the calculated median lethal intraperitoneal dose (LD50) in mice. The method for performing the assay is specific to Solstice Neurosciences' manufacture of MYOBLOC. Due to differences in specific details such as the vehicle, dilution scheme and laboratory protocols for various mouse LD50 assays, Units of biological activity of MYOBLOC cannot be compared to or converted into Units of any other botulinum toxin or any toxin assessed with any other specific assay method. Therefore, differences in species sensitivities to different botulinum neurotoxin serotypes preclude extrapolation of animal dose-activity relationships to human dose estimates. The specific activity of MYOBLOC ranges between 70 to 130 Units/ng.

MYOBLOC is an acetylcholine release inhibitor indicated for: Treatment of cervical dystonia to reduce the severity of abnormal head position and neck pain associated with cervical dystonia in adults ( 1.1 ) Treatment of chronic sialorrhea in adults ( 1.2 ) MYOBLOC is indicated for the treatment of cervical dystonia to reduce the severity of abnormal head position and neck pain associated with cervical dystonia in adults. MYOBLOC is indicated for the treatment of chronic sialorrhea in adults.

Cervical Dystonia: for patients with demonstrated tolerance of botulinum toxin injection, recommended total dosage is 2,500 Units to 5,000 Units divided among effected muscles ( 2.2 ) Chronic Sialorrhea: recommended dosage is 1,500 Units to 3,500 Units; 500 Units to 1,500 Units per parotid gland and 250 Units per submandibular gland; no more frequent than every 12 weeks ( 2.3 ) The potency units of MYOBLOC are specific to the preparation and assay method utilized. They are not interchangeable with other preparations of botulinum toxin products and cannot be compared to or converted into units of any other botulinum toxin products [see Warnings and Precautions (5.2) , Description (11) ] . Each single-dose vial should only be used during one session and only for one patient. Discard any remaining solution in the vial. MYOBLOC is ready to use; no reconstitution required. MYOBLOC may be diluted with 0.9% Sodium Chloride Injection. Once diluted, the product must be used within 4 hours as the formulation does not contain a preservative. The recommended initial dosage of MYOBLOC for cervical dystonia patients with a prior history of tolerating botulinum toxin injections is 2,500 Units to 5,000 Units divided among affected muscles [see Clinical Studies (14.1) ] . Patients without a prior history of tolerating botulinum toxin injections should receive a lower initial dosage [see Adverse Reactions (6.1) ] . Subsequent dosing should be determined by the patient's individual response. MYOBLOC should be administered by physicians familiar with and experienced in the assessment and management of patients with cervical dystonia. The duration of effect in patients responding to MYOBLOC treatment for cervical dystonia has been observed in studies to be between 12 and 16 weeks at doses of 5,000 Units or 10,000 Units [see Clinical Studies (14.1) ] . Dosing Information The recommended dosage of MYOBLOC for chronic sialorrhea is 1,500 Units to 3,500 Units, divided among the parotid and submandibular glands (Table 1). Patient response to treatment should be considered when determining subsequent MYOBLOC dosage [see Clinical Studies (14.2) ] . The typical duration of effect of each treatment is up to 3 months; however, the effect may vary in individual patients. The frequency of MYOBLOC repeat treatments should be determined by clinical response but should generally be no more frequent than every 12 weeks. Table 1: Dosing by Gland for Chronic Sialorrhea in Adults Gland Recommended Dosage Parotid 500 Units to 1,500 Units per gland Submandibular 250 Units per gland Administration Information A suitable sterile needle (e.g., 30-gauge, 0.5 inch) should be used for intra-salivary gland administration. Figure 1: Glands for Injection in Chronic Sialorrhea Guidelines for locating salivary glands using anatomical landmarks (Figure 1): 1. To inject the parotid gland, bisect the distance between the tip of the tragus (Site A) and the angle of the mandible (Site B). Inject one finger breadth anterior to this site (Injection Site 1). 2. To inject the submandibular gland, bisect the distance between the angle of the mandible (Site B) and the tip of the chin (Site C). Inject one finger breadth medial to the inferior surface of the point of bisection (Injection Site 2). In clinical studies, MYOBLOC was injected using anatomical landmarks to localize the salivary glands, or using ultrasound guidance for gland location. Both methods produced similar reduction in the unstimulated salivary flow rate. Figure 1

MYOBLOC is a clear and colorless to light-yellow solution available as: Injection: 2,500 Units/0.5 mL in a single-dose vial Injection: 5,000 Units/mL in a single-dose vial Injection: 10,000 Units/2 mL (5,000 Units/mL) in a single-dose vial Injection: 2,500 Units/0.5 mL; 5,000 Units/mL; or 10,000 Units/2 mL (5,000 Units/mL) in a single-dose vial ( 3 )

MYOBLOC is contraindicated in patients with: A known hypersensitivity to any botulinum toxin product or to any of the components in the formulation [see Warnings and Precautions (5.3) , Description (11) ] Infection at the proposed injection site(s) MYOBLOC is contraindicated in patients with: Known hypersensitivity to any botulinum toxin preparation or to any of the components in the formulation ( 4 , 5.3 ) Infection at the proposed injection site(s) ( 4 )

Spread of toxin effects; swallowing and breathing difficulties can lead to death. Seek immediate medical attention if respiratory, speech or swallowing difficulties occur ( 5.1 , 5.4 ) MYOBLOC potency units cannot be compared to or converted into units of other botulinum toxins ( 5.2 ) Patients with neuromuscular disorders should be monitored closely for swallowing/breathing difficulty ( 5.4 ) Postmarketing safety data from MYOBLOC and other approved botulinum toxins suggest that botulinum toxin effects may, in some cases, be observed beyond the site of local injection. The symptoms are consistent with the mechanism of action of botulinum toxin and may include asthenia, generalized muscle weakness, diplopia, blurred vision, ptosis, dysphagia, dysphonia, dysarthria, urinary incontinence, and breathing difficulties. These symptoms have been reported hours to weeks after injection. Swallowing and breathing difficulties can be life threatening and there have been reports of death related to spread of toxin effects. The risk of symptoms is probably greatest in children treated for spasticity, but symptoms can also occur in adults treated for spasticity and other conditions, and particularly in those patients who have underlying conditions that would predispose them to these symptoms. In unapproved uses, including spasticity in children and adults, and in approved indications, symptoms consistent with spread of toxin effect have been reported at doses comparable to or lower than doses used to treat cervical dystonia. The potency units of MYOBLOC are specific to the preparation and biological activity assay method utilized. Due to differences in the aspects of this assay such as the vehicle, dilution scheme, and laboratory protocols for various potency assays, potency units are not interchangeable with other preparations of botulinum toxin products and, therefore, units of biological activity of MYOBLOC cannot be compared to or converted into units of any other botulinum toxin products assessed with any other specific assay method [see Description (11) ] . Serious hypersensitivity reactions have been reported with botulinum toxin products. Angioedema, urticaria, and rash have occurred with MYOBLOC treatment [see Adverse Reactions (6.3) ]. Hypersensitivity reactions can also include anaphylaxis, serum sickness, soft tissue edema, and dyspnea. If serious and/or immediate hypersensitivity reactions occur, discontinue further injection of MYOBLOC and institute appropriate medical therapy immediately. The use of MYOBLOC in patients with a known hypersensitivity to any botulinum neurotoxin or to any of the excipients (human albumin, sucrose), could lead to a life-threatening allergic reaction [see Contraindications (4) , Adverse Reactions (6.3) ]. Treatment with MYOBLOC and other botulinum toxin products can result in swallowing or breathing difficulties. Patients with pre-existing swallowing or breathing difficulties may be more susceptible to these complications. In most cases, this is a consequence of weakening of muscles in the area of injection that are involved in breathing or swallowing. When distant effects occur, additional respiratory muscles may be involved. Deaths as a complication of severe dysphagia have been reported after treatment with botulinum toxin. Dysphagia may persist for several months and require use of a feeding tube to maintain adequate nutrition and hydration. Aspiration may result from severe dysphagia and is a particular risk when treating patients in whom swallowing or respiratory function is already compromised. Treatment of cervical dystonia with botulinum toxins may weaken neck muscles that serve as accessory muscles of ventilation. This may result in a critical loss of breathing capacity in patients with respiratory disorders who may have become dependent upon these accessory muscles. There have been postmarketing reports of serious breathing difficulties, including respiratory failure, in cervical dystonia patients. Patients treated with botulinum toxin may require immediate medical attention should they develop problems with swallowing, speech or respiratory disorders. These reactions can occur within hours to weeks after injection with botulinum toxin [see Adverse Reactions (6.1) ] . Individuals with peripheral motor neuropathic diseases, amyotrophic lateral sclerosis, or neuromuscular junctional disorders (e.g., myasthenia gravis or Lambert-Eaton syndrome) should be monitored particularly closely when given botulinum toxin. Patients with neuromuscular disorders may be at increased risk of clinically significant effects including severe dysphagia and respiratory compromise from typical doses of MYOBLOC [see Adverse Reactions (6.1) ] . This product contains albumin, a derivative of human blood. Based on effective donor screening and product manufacturing processes, it carries an extremely remote risk for transmission of viral diseases and variant Creutzfeldt-Jakob disease (vCJD). There is a theoretical risk for transmission of Creutzfeldt-Jakob disease (CJD), but if that risk actually exists, the risk of transmission would be considered extremely remote. No cases of transmission of viral diseases, CJD, or vCJD have ever been identified for licensed albumin or albumin contained in other licensed products.

The following clinically significant adverse reactions to MYOBLOC are discussed in greater detail in other sections of the labeling:

Co-administration with aminoglycosides or other agents interfering with neuromuscular transmission may potentiate effects of MYOBLOC ( 7.1 ) Co-administration or overlapping of botulinum toxin serotypes (within 4 months) may potentiate neuromuscular paralysis ( 7.3 ) Co-administration of MYOBLOC and aminoglycosides or other agents interfering with neuromuscular transmission (e.g., curare-like compounds) should only be performed with caution as the effect of the toxin may be potentiated. Use of anticholinergic drugs after administration of MYOBLOC may potentiate systemic anticholinergic effects. The effect of administering different botulinum toxin products at the same time or within several months of each other is unknown. Excessive neuromuscular weakness may be exacerbated by administration of another botulinum toxin prior to the resolution of the effects of a previously administered botulinum toxin. Excessive weakness may also be exaggerated by administration of a muscle relaxant before or after administration of MYOBLOC.

Risk Summary There are no adequate data on the developmental risks associated with the use of MYOBLOC in pregnant women. No developmental toxicity was observed in pregnant rats administered MYOBLOC by intramuscular injection during gestation and lactation, at doses producing maternal toxicity. In the U.S. general population, the background risk of major birth defects and miscarriage in clinically recognized pregnancies is 2% to 4% and 15% to 20%, respectively. The background risk of major birth defects and miscarriage for the indicated population is unknown. Data Animal Data When MYOBLOC was administered by intramuscular injection to pregnant rats (0, 300, 1000, or 3000 Units/kg/day) or rabbits (0, 0.03, 0.1, 0.3, or 1.0 Units/kg/day) throughout gestation, no adverse effects on embryofetal development were observed. The highest dose tested in rat, which was associated with maternal toxicity, was 36 times the maximum recommended human dose (MRHD) for cervical dystonia (5000 Units) on a body weight (Units/kg) basis. The highest dose tested in rabbit was substantially less than the MRHD for cervical dystonia on a Units/kg basis; maternal toxicity was observed at all but the lowest dose tested. Risk Summary There are no data on the presence of MYOBLOC in human milk, the effects on the breastfed infant, or the effects on milk production. The developmental and health benefits of breastfeeding should be considered along with the mother's clinical need for MYOBLOC and any potential adverse effects on the breastfed infant from MYOBLOC or from the underlying maternal condition. Safety and effectiveness in pediatric patients have not been established. Cervical Dystonia In the controlled studies for MYOBLOC in patients with cervical dystonia, 152 (75%) were under the age of 65, and 52 (26%) were 65 years of age or older [see Clinical Studies (14.1) ] . For these age groups, the most frequently reported adverse reactions occurred at similar rates in both age groups. Efficacy results did not suggest any large differences between these age groups. Very few patients age 75 or older were enrolled; therefore, no conclusions regarding the safety and efficacy of MYOBLOC within this age group can be determined. Chronic Sialorrhea Of the 166 MYOBLOC-treated patients in the placebo-controlled studies for treatment of chronic sialorrhea [see Clinical Studies (14.2) ] , 105 (63%) were 65 years of age or older, and 43 (26%) were 75 years of age or older. No overall differences in safety or effectiveness were observed between patients over 65 years of age and younger patients, but greater sensitivity of some older patients cannot be ruled out.

MYOBLOC (rimabotulinumtoxinB) injection is supplied as a clear and colorless to light-yellow solution in single-dose glass vials. MYOBLOC is available in three presentations (Table 10). Table 10: MYOBLOC Presentations Strength per Vial Single-Vial Carton 2,500 Units/0.5 mL NDC 10454-710-10 5,000 Units/mL NDC 10454-711-10 10,000 Units/2 mL NDC 10454-712-10 No U.S. Standard of Potency Store under refrigeration at 2°C to 8°C (36°F- 46°F) in the original carton to protect from light. DO NOT FREEZE. DO NOT SHAKE. All vials of expired MYOBLOC and equipment used in the administration of MYOBLOC should be carefully discarded according to standard medical waste practices. Do not use after the expiration date stamped on the vial.

MYOBLOC blocks cholinergic transmission at the neuromuscular and salivary neuroglandular junction by inhibiting the release of acetylcholine from peripheral cholinergic nerved terminals. This inhibition occurs according to the following sequence: neurotoxin binding to cholinergic nerve terminals, internalization of the neurotoxin into the nerve terminal, translocation of the light-chain part of the molecule into the cytosol of the nerve terminal, and enzymatic cleavage of synaptic Vesicle Associated Membrane Protein (VAMP, also known as synaptobrevin), a presynaptic target protein essential for the release of acetylcholine. In both muscles and glands, impulse transmission is re-established by the formation of new nerve endings. In responders, the return of increased muscle tone or saliva production typically starts within 3 to 4 months after injection. Using currently available analytical technology, it is not possible to detect MYOBLOC in the peripheral blood following intramuscular or intraglandular injection at the recommended doses.

Carcinogenesis No long-term carcinogenicity studies in animals have been conducted. Mutagenesis No genetic toxicology studies have been conducted. Impairment of Fertility Intramuscular administration of MYOBLOC (0, 300, 1000, or 3000 Units/kg/day) to male and female rats prior to and throughout the mating period and continuing in females to gestation day 6 resulted in decreases in implantation sites and viable fetuses at the high dose of 3000 Units/kg/day, which was associated with maternal toxicity. The no-effect dose for reproductive toxicity (1000 Units/kg/day) is 12 times the maximum recommended human dose for cervical dystonia (5000 Units) on a body weight (Units/kg) basis.

Two Phase 3, randomized, multi-center, double-blind, placebo-controlled studies of the treatment of cervical dystonia were conducted (Study 1 and Study 2). Both studies enrolled only adult patients who had a history of receiving botulinum toxin type A in an open-label manner, with a perceived good response and tolerable adverse effects. Study 1 enrolled patients who were perceived as having an acceptable response to type A toxin, while Study 2 enrolled only patients who had secondarily lost responsiveness to type A toxin. Other eligibility criteria common to both studies were that all patients had moderate or greater severity of cervical dystonia with at least 2 muscles involved, no neck contractures or other causes of decreased neck range of motion, and no history of any other neuromuscular disorder. Patients in Study 1 were randomized to receive placebo, MYOBLOC 5,000 Units or MYOBLOC 10,000 Units. Patients in Study 2 were randomized to receive placebo or 10,000 Units of MYOBLOC. The study agent was administered to subjects in a single treatment session by investigators who selected 2 to 4 muscles per subject from the following: splenius capitis, sternocleidomastoid, levator scapulae, trapezius, semispinalis capitis, and scalene muscles. The total dose was divided between the selected muscles, and from 1 to 5 injections were made per muscle. There were 109 patients enrolled into Study 1, and 77 into Study 2. Patient evaluations continued for 16 weeks post injection. The primary efficacy outcome variable for both studies was the Toronto Western Spasmodic Torticollis Rating Scale (TWSTRS)-Total Score (scale range of possible scores is 0–87) at Week 4. TWSTRS is comprised of three sub-scales which examine 1) Severity—the severity of the patient's abnormal head position; 2) Pain—the severity and duration of pain due to the dystonia; and 3) Disability— the effects of the abnormal head position and pain on a patient's activities. The secondary endpoints were the Patient Global and Physician Global Assessments of change at Week 4. Both Global Assessments used a 100-point visual-analog scale (VAS). The Patient Global Assessment allows patients to indicate how they feel at the time of their evaluation compared to the pre-injection baseline. Likewise, the Physician Global Assessment indicates the physician's assessment of a patient's change from baseline to Week 4. Scores of 50 indicate no change, 0 much worse, and 100 much better. Results of comparisons of the primary and secondary efficacy variables are summarized in Table 4. Table 4: Efficacy Results From Two Phase 3 MYOBLOC Studies in Cervical Dystonia STUDY 1 STUDY 2 Assessments 95% Cl are for the differences between the active and placebo groups. The P values are for the comparison of active dose and placebo. For TWSTRS-Total and TWSTRS-subscale scores, P values are from ANCOVA for each variable with center and treatment in the model and the baseline value of the variable included as a covariate. For the Patient Global and Physician Global Assessments, P values are from ANOVA for each variable with center and treatment in the model. Placebo (N=36) MYOBLOC 5,000 Units (N=36) MYOBLOC 10,000 Units (N=37) Placebo (N=38) MYOBLOC 10,000 Units (N=39) TWSTRS Total Mean at Baseline 43.6 46.4 46.9 51.2 52.8 Change from Baseline -4.3 -9.3 -11.7 -2.0 -11.1 95% Confidence Interval (-8.9, -1.2) (-11.1, -3.3) (-12.2, -5.2) P value 0.012 0.0004 0.0001 Patient Global Mean at Week Four 43.6 60.6 64.6 39.5 60.2 95% Confidence Interval (7.0, 26.9) (11.3, 31.1) (11.2, 29.1) P value 0.001 0.0001 0.0001 Physician Global Mean at Week Four 52.0 65.3 64.2 47.9 60.6 95% Confidence Interval (5.5, 21.3) (3.9, 19.7) (7.4, 18.1) P value 0.001 0.004 0.0001 TWSTRS-Subscales – Severity Mean at Baseline 18.4 20.2 20.2 22.1 22.6 Change from Baseline -2.3 -3.2 -4.8 -1.2 -3.7 95% Confidence Interval (-2.5, 0.6) (-4.0, -1.0) (-3.9, -1.0) P value 0.22 0.002 0.001 – Pain Mean at Baseline 10.9 11.8 12.4 12.2 11.9 Change from Baseline -0.5 -3.6 -4.2 -0.2 -3.6 95% Confidence Interval (-4.7, -1.1) (-5.1, -1.4) (-5.0, -2.1) P value 0.002 0.0008 0.0001 – Disability Mean at Baseline 14.3 14.4 14.4 16.9 18.3 Change from Baseline -1.6 -2.5 -2.7 0.8 -3.8 95% Confidence Interval (-2.7, 0.7) (-2.8, 0.6) (-4.1, -1.0) P value 0.26 0.19 0.002 There were no statistically significant differences in results between the 5,000 Unit and 10,000 Unit doses in Study 1. Exploratory analyses of these two studies suggested that the majority of patients who showed a beneficial response by Week 4 had returned to their baseline status between Weeks 12 to 16 post injection. Although there was a MYOBLOC-associated decrease in pain, there remained many patients who experienced an increase in dystonia-related neck pain irrespective of treatment group [ See Adverse Reactions, (6.1) ] . TWSTRS Total Score at Week 4 and Patient Global Assessment among subgroups by gender or age showed consistent treatment-associated effects across these subgroups [see Use in Specific Populations (8.5) ]. There were too few non-Caucasian patients enrolled to draw any conclusions regarding relative efficacy in racial subsets. MYOBLOC was studied in two Phase 2 dose-ranging studies, Studies 3 and 4, which preceded the Phase 3 studies. Studies 3 and 4 had a study design similar to the Phase 3 studies, including eligibility criteria. Study 3 enrolled 85 patients randomized to placebo, MYOBLOC 400 Units, MYOBLOC 1,200 Units, or MYOBLOC 2,400 Units (21 or 22 patients per group). Study 4 enrolled 122 patients randomized to placebo, MYOBLOC 2,500 Units, MYOBLOC 5,000 Units, or MYOBLOC 10,000 Units (30 or 31 patients per group). These studies demonstrated efficacy on the TWSTRS-Total, baseline to Week 4, at doses of 2,400 Units; 2,500 Units; 5,000 Units; and 10,000 Units. Study 3 showed mean improvement from baseline on the Week 4 TWSTRS for placebo and 2,400 Units of 2.0 and 8.5 points respectively (from baselines of 42.0 and 42.4 points). Study 4 showed mean improvement from baseline to Week 4 for placebo, MYOBLOC 2,500 Units, MYOBLOC 5,000 Units, and MYOBLOC 10,000 Units of 3.3, 11.6, 12.5, and 16.4 points, respectively (from baseline of 45.5, 45.6, 45.2, and 47.5 points). Study 3 also showed less response for doses below 2,400 Units. Study 5 was an open-label, intrapatient dose-escalation study of 3 treatment sessions where each patient with cervical dystonia sequentially received 10,000 Units; 12,500 Units; and 15,000 Units of MYOBLOC, at periods of 12 to 16 weeks between treatment sessions irrespective of their response to their previous dose. This study enrolled 145 patients, of whom 125 received all three treatments. Although this was an open-label design where investigators and patients knew the dose at each treatment session, there were similar mean improvements on the TWSTRS-Total, from baseline to Week 4, for all three doses. In the MYOBLOC-treated patients (n=112) of the Phase 3 studies, 19% had 2 muscles injected, 48% had 3 muscles injected, and 33% had 4 muscles injected. Table 5 indicates the frequency of use for each of the permitted muscles, and the fraction of the total dose of the treatment injected into each muscle, for those patients in whom the muscle was injected. Table 5: Study 1 and Study 2 Combined Data Fraction of Total Dose Injected into Involved Muscles in Patients with Cervical Dystonia Muscle Injected Percent Frequency Injected Percent frequency of patients in whom each muscle was injected Fraction of Total Dose Injected by Percentiles 25th 50th 75th Splenius Capitis 88 0.30 0.40 0.50 Sternocleidomastoid 80 0.20 0.25 0.30 Semispinalis Capitis 52 0.30 0.36 0.50 Levator Scapulae 46 0.13 0.20 0.20 Trapezius 38 0.20 0.25 0.35 Scalene Complex 13 0.20 0.25 0.30 Study 1 Study 1 (NCT01994109) was a multicenter, randomized, double-blind, placebo-controlled study of a single treatment of chronic sialorrhea (with 13-week follow-up), followed by an open-label treatment period. 187 adult patients with chronic, troublesome sialorrhea for at least 3 months were randomized to receive treatment with MYOBLOC 2,500 Units, MYOBLOC 3,500 Units, or placebo. Patients had chronic sialorrhea associated with Parkinson's disease (n=122), amyotrophic lateral sclerosis(ALS) (n=12), stroke (n=13), and other causes (n=40). Patients with a history of aspiration or severe dysphagia in the last 6 months and ALS patients with a forced vital capacity of less than 20% of predicted were excluded from the study. A single treatment was administered, consisting of bilateral injections of MYOBLOC into the parotid (1,000 Units or 1,500 Units per gland) and submandibular (250 Units per gland) salivary glands or volume matched placebo. A total of 114 patients received 4 consecutive treatments with 3,500 Units of MYOBLOC every 11 to 15 weeks. The co-primary efficacy endpoints for Study 1 were the change from baseline in Unstimulated Salivary Flow Rate (USFR) and the Clinical Global Impression of Change (CGI-C) assessed 4 weeks after treatment in the double-blind part of the study. The CGI-C is a seven-point Likert scale with scores ranging from "1=very much improved" to "7=very much worse". The change from baseline (i.e., decrease) in USFR at Week 4 was significantly greater for patients treated with MYOBLOC than in patients on placebo (Table 6). Similarly, CGI-C scores at Week 4 were significantly lower (i.e., better) in patients treated with MYOBLOC than in patients on placebo (Table 7). Chronic sialorrhea was 'much improved' or 'very much improved', according to CGI-C scores at Week 4 post injection, in patients treated with MYOBLOC 2,500 Units (60%) and MYOBLOC 3,500 Units (53%) than in patients on placebo (12%). Figure 2 and Figure 3 show change in the USFR and CGI-C, respectively over the 13-week double-blind part of Study 1. The change from baseline to Week 4 on the USFR and the CGI-C was similar for MYOBLOC 2,500 Units and 3,500 Units, but there was a trend for more prolonged effect in patients treated with MYOBLOC 3,500 Units (Figure 2). CGI-C scores over the double-blind period were similar for both dose groups (Figure 3). Table 6: Mean USFR Change from Baseline (g/min) at Week 4 in Study 1 Visit MYOBLOC 2,500 Units (N=63) MYOBLOC 3,500 Units (N=64) Placebo (N=57) Week 4 -0.37 Primary endpoint, p< 0.0001 -0.36 -0.07 Table 7: CGI-C Score at Week 4 in Study 1 Visit MYOBLOC 2,500 Units (N=63) MYOBLOC 3,500 Units (N=64) Placebo (N=57) Week 4 2.38 Co-primary endpoint, p< 0.0001 2.45 3.59 Figure 2: Mean Unstimulated Salivary Flow Rate over Time in Study 1 Figure 3: Mean Clinical Global Impression of Change Score over Time in Study 1 Figure 2 Figure 3 Study 2 Study 2 (NCT00515437) was a multicenter, double-blind, placebo-controlled, sequential dose-escalation study of MYOBLOC 1,500 Units; 2,500 units; or 3,500 Units versus matching placebo for the treatment of troublesome chronic sialorrhea in patients with Parkinson's disease. Patients were randomized to receive a single treatment with MYOBLOC 1,500 Units (n=14); MYOBLOC 2,500 Units (n=12); or MYOBLOC 3,500 Units (n=13). Each group also included 5 patients who received placebo (n=15). Patients were followed for up to 20 weeks after injection. The mean age of patients in the study was 71 years. In the study, 89% of patients were male, and 96% White. The change from baseline in the unstimulated salivary flow rate (USFR) and the Clinical Global Impression of Change (CGI-C) was assessed 4 weeks after treatment. There was a significant reduction in the USFR for all three dosage groups of MYOBLOC, compared with patients on placebo (Table 8). Similarly, the CGI-C scores were significantly lower in all three MYOBLOC dosage groups than in patients on placebo (Table 9). The mean change from baseline to Week 4 on the USFR was similar in all three MYOBLOC dosage groups. Table 8: Mean USFR Change from Baseline (g/min) at Week 4 in Study 2 Visit MYOBLOC 1,500 Units (N=14) MYOBLOC 2,500 Units (N=12) MYOBLOC 3,500 Units (N=13) Placebo (N=14) Week 4 -0.44 Nominal p-value <0.0001; -0.38 -0.30 Nominal p-value < 0.001 0.01 Table 9: CGI-C Score at Week 4 in Study 2 Visit MYOBLOC 1,500 Units (N=14) MYOBLOC 2,500 Units (N=12) MYOBLOC 3,500 Units (N=13) Placebo (N= 14) Week 4 2.14 Nominal p-value < 0.0001 2.00 1.62 3.93

NDC 10454-710-10 Rx Only rimabotulinumtoxinB MYOBLOC ® Injection FOR INTRAMUSCULAR AND INTRAGLANDULAR USE 2,500 Units/0.5 mL WARNING: Dosing units of botulinum toxins are not interchangeable between commercial products. Single-dose Vial Discard Unused Portion Dispense the accompanying Medication Guide to each patient. SOLSTICE ® NEUROSCIENCES US WorldMeds ® PRINCIPAL DISPLAY PANEL - 0.5 mL Vial Carton