Been experiencing leg and feet jerks for a few weeks now. it's an involuntary jerk. also happens when falling asleep. on lexapro (escitalopram) 20mg for 2 month help?

If its both feet: and occasional don't worry. If its just one leg / foot (the same one) you need to get an EEG. All antidepressants lower the seizure threshold a bit. Focal seizures are more likely to occur as one transitions from one stage of sleep to another. If its preventing you from getting restful sleep see your doctor for an evaluation and a sleep study (periodic limb movement).