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.
Causes of Similar Symptoms to Myoclonic jerking. Research the causes of these symptoms that are similar to, or related to, the symptom Myoclonic jerking: 1  Alzheimer's disease (2 causes). 2  Creutzfeldt-Jacob disease (CJD). 3  Epilepsy (132 causes). 4  Lennox-Gastaut syndrome. 5  Lupus (14 causes). 6  Multiple sclerosis. 7  Parkinson's disease. 8  Progressive myoclonus epilepsy.