Botulinum Toxin Type B
Botulinum Toxin Type B is a neurotoxin protein that temporarily reduces muscle activity by blocking nerve signals at the neuromuscular junction. It is primarily used to treat cervical dystonia, a neurological disorder causing severe neck muscle spasms and abnormal head positioning.
A neurotoxin injection that temporarily relaxes overactive muscles, primarily used for cervical dystonia.
Key facts at a glance
- RxNorm
- 2167673
- Generic
- Botulinum Toxin Type B
- Class
- unclassified
- Brands
- Myobloc
- Availability
- rx
- Lactation
- unknown
- Routes
- —
- Forms
- injection
- Regions
- US, EU, CN, JP
- Monitoring
- —
This page is for informational purposes only.
Do not use this information to diagnose yourself or to replace a physician's advice. Always consult a qualified healthcare provider before starting, stopping, or changing any medication. If you believe you are experiencing a medical emergency, call your local emergency number immediately.
FDA-approved for treating cervical dystonia (spasmodic torticollis) to reduce the severity of abnormal head position, neck pain, and associated muscle spasms. May also be used off-label for other conditions involving involuntary muscle contractions or excessive muscle activity.
A purified neurotoxin that blocks the release of acetylcholine, the neurotransmitter responsible for muscle contraction, at the neuromuscular junction. This results in temporary chemical denervation and relaxation of the treated muscles.
Administered by qualified healthcare professionals via intramuscular injection into affected muscles. Effects typically begin within 1-2 weeks and last approximately 3-4 months. Common side effects include dry mouth, swallowing difficulty, injection site pain, and muscle weakness. There is a risk of toxin spread beyond the treatment area causing systemic effects. Contraindicated in patients with infections at injection sites or known hypersensitivity to any formulation components.
Official drug label
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This information is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment.
This content is for general informational and educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the guidance of a qualified healthcare provider with any questions you have about a medical condition, and never disregard professional medical advice or delay seeking it because of something you read here.
If you think you may have a medical emergency, call your local emergency number or go to the nearest emergency department immediately.
Medically reviewed by WellAlly Editorial Team Last reviewed August 29, 2026. · Read our editorial policy