I've been on 10mg of lexapro (escitalopram) for 3 days and the side effects are bothering me. is it ok to reduce it to 5mg for a few days? my dr. is unavailable.

Try 5mg AM & 5mg PM: Does your Dr have a backup? That might be worth a try. Otherwise, since you've just started it, early short-lived side effects are common and may disappear on their own. Another reasonably safe way to lessen them may be to take half in the morning and half at night. That's probably less risky than half dose per day. As you know, keep Dr informed ASAP! Best wishes!