Prozac - Does fluoxetine 20 mg cause dilated pupils?

Hi, Mandyy!
These symptoms are called mydriasis and hyperhidrosis and are side effects when starting Prozac (and many other antidepressants):
"Common (1% to 10%): Sweating/hyperhidrosis"
"Uncommon (0.1% to 1%): Dry eyes, mydriasis, photophobia"
They generally resolve in just a few days to a week or two so you should talk to your health care provider for professional advice. Perhaps a temporary dosage adjustment might help your metabolism adjust to the medication more smoothly.