No. Muscle side effects should abate after discontinuation, which should only be done under your doctor's guidance. Stopping these medications on your own may result in other more serious problems.
No. Use of selective serotonin re-uptake inhibitors, for example; prozac, paxil, zoloft, celexa, lexapro, luvox, viibryd, (vilazodone hydrochloride) etc. May cause myoclonic jerk or twitching of muscles. This is a reversible side effect. Another side effect is serotonin syndrome, which can cause significant muscle contraction and jitteriness. It can be a life threatening condition, but immediate medical help works very well.
Does serotonin cause muscular rigidity via its effects in the central nervous system or by binding to peripheral 5-ht receptors in the body?
Centrally. Overstimulation of primarily the 5-ht2a receptors seems the leading hypothesis currently. Read more...