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.
A patient primer from the UF Health Center for Movement Disorders & Neurorestoration. Myoclonus is a term that refers to a specific type of movements, rather than a disease. It can be defined as brief, lightening-like muscle jerking movements that occur suddenly.