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.
Generalized. It may be physiologic or pathologic. Physiologic myoclonus may occur when a person is falling asleep and during early sleep phases (called hypnic myoclonus). Hypnic myoclonus can be focal, multifocal, segmental, or generalized and may resemble a startle reaction. Another form of physiologic myoclonus is hiccuping (diaphragmatic myoclonus). Pathologic myoclonus can result from various disorders and drugs (see Table: Causes of Myoclonus). The most common causes are.