What are the possible side effects of Isoptin SR (Verapamil)?
If you experience any of the following serious side effects, stop taking verapamil and contact your doctor immediately or seek emergency medical treatment: an allergic reaction (difficulty breathing; closing of the throat; swelling of the lips, tongue, or face; or hives) an unusually fast or slow heartbeat shortness of breath (heart failure) fainting abnormal behavior or psychosis jaundice (yellowing of the skin or eyes); or swelling of the legs or ankles Other, less serious side effects may be more likely to occur. Continue to take verapamil and talk to your doctor if you experience unusual headache, fatigue, or tiredness insomnia or trouble sleeping vivid dreams hair loss nausea or diarrhea; or increased urination Side effects other than those listed here may also occur. Talk to your doctor about any side effect that seems unusual or that is especially bothersome.
