Myobloc

Generic name:rimabotulinumtoxinB (Myobloc) [ RYE-ma-BOT-ue-LYE-num-TOX-in-B ]
Drug class:Skeletal muscle relaxants

Medically reviewed by Drugs.com on Jul 29, 2020. Written by Cerner Multum.

What is rimabotulinumtoxinB (Myobloc)?

RimabotulinumtoxinB (Myobloc), also called botulinum toxin type B, is made from the bacteria that causes botulism. Botulinum toxin blocks nerve activity in the muscles, causing a temporary reduction in muscle activity.

Myobloc is used to treat cervical dystonia (severe spasms in the neck muscles).

Myobloc is also used to treat chronic drooling (sialorrhea).

Myobloc may also be used for purposes not listed in this medication guide.

Warnings

You should not receive Myobloc if you are allergic to botulinum toxin, or if you have an infection in the area where the medicine will be injected.

The botulinum toxin contained in this medication can spread to other body areas beyond where it was injected. This can cause serious life-threatening side effects.

Call your doctor at once if you have a hoarse voice, drooping eyelids, vision problems, severe muscle weakness, loss of bladder control, or trouble breathing, talking, or swallowing. Some of these effects can occur up to several weeks after a botulinum toxin injection.

Before taking this medicine

You should not be treated with Myobloc if you are allergic to botulinum toxin, or if you have an infection in the area where the medicine will be injected.

Tell your doctor if you have ever had a side effect after receiving a botulinum toxin in the past.

Tell your doctor if you have ever had:

• other botulinum toxin injections such as BotoxDysport, or Xeomin (especially in the last 4 months);

• amyotrophic lateral sclerosis (ALS, or "Lou Gehrig's disease");

• myasthenia gravis;

• Lambert-Eaton syndrome;

• a breathing problem such as asthma or emphysema;

• droopy eyelids;

• problems with swallowing;

• bleeding problems;

• surgery on your face; or

• if you are planning to have any type of surgery.

Myobloc is made from donated human plasma and may contain viruses or other infectious agents. Donated plasma is tested and treated to reduce the risk of contamination, but there is still a small possibility it could transmit disease. Ask your doctor about any possible risk.