What side effects may I notice from receiving Myobloc?

Side effects that you should report to your doctor or health care professional as soon as possible:

-allergic reactions like skin rash, itching or hives, swelling of the face, lips, or tongue
-breathing problems
-chest pain or tightness
-infection
-numbness
-speech problems
-swallowing problems
Side effects that usually do not require medical attention (report to your doctor or health care professional if they continue or are bothersome):

-bruising or pain at site where injected
-dry eyes, mouth
-headache
-muscle pain
-nausea, stomach upset

This list may not describe all possible side effects for Myobloc. Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.