Express your concerns with the Dr that prescribed
your meds. Don't just change on your own. I take a different med and it is available in a 37.5mg dose.
So far as the twitching, it could just be a spasm.
If it becomes an issue with you, check with your Dr.
I have a condition known as Restless Leg Syndrome,
(aka RLS). It is mainly an uncontrollable spasm, twitch, or jerking in the legs and feet. But, as in
my case, it will sometimes affect me in the arms, face abdomen, and shoulders. It mostly only affects me when I'm at rest or trying to relax.
Hope this helps,
Della from SC