Medically reviewed by Brigid Dwyer, MD Key Takeaways Clonus causes involuntary, rhythmic muscle contractions when a muscle is stretched.It is often observed in conditions like multiple sclerosis, ...

The prevalence of serotonin syndrome, which, at its most severe, is a potentially life-threatening drug reaction that increases serotonin levels, is strikingly high in patients receiving buprenorphine ...