Possible side effects of Alka-Seltzer effervescent tablets: All medicines may cause side effects, but many people have no, or minor, side effects. Check with your doctor if any of these most COMMON side effects persist or become bothersome: Heartburn; nausea; upset stomach.
A myoclonic jerk is the brief, involuntary twitching of a muscle or group of muscles. It may be caused either by a sudden muscle contraction, or a sudden lapse of contraction.
Rapid, synchronous muscle jerking: Introduction. Rapid, synchronous muscle jerking: also called myoclonus. They are quick, involuntary muscle jerks. See detailed information below for a list of 28 causes of Rapid, synchronous muscle jerking, Symptom Checker, including diseases and drug side effect causes. Â» Review Causes of Rapid, synchronous muscle jerking: Causes | Symptom Checker Â».