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.
what causes your body to jerk so hard it wakes you from your sleep. this happens several times during the night. I sometime have jerking when I am awake during the day. The sudden, involuntary jerking of a muscle or group of muscles is known as myoclonus. It may occur alone or in sequence, infrequently or many times each minute.