Propranolol
"I started taking Propranolol 4 months ago for Migraines primarily as well as high blood pressure. I am 5'1" and weigh 106lbs and have not experienced any weight gain. It bothers me that people say they gain weight from a pill.  Unless that pill is increasing your appetite it just can't happen.  Weight gain is natural science.  What you put in opposed to what you expend.  You can not be seditary and not gain weight.  The migraines are gone as well as the blood pressure.  All and all I think it is an excellent drug except for the fact my sex drive is not very good."