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.
Some of the possible common medical causes of Myoclonic jerking may include: 1  Multiple sclerosis. 2  Parkinson's disease. 3  Alzheimer's disease. 4  Subacute sclerosing panencephalitis. 5  Creutzfeldt-Jakob disease (CJD).