My Side effects: major heart palpitations, numb/tingling hands almost every morning upon awakening, fatigue, thinning hair, bloating/weight gain. I am 43 yrs old, not overweight & in good health other than my BP. I was on atenelol for about 8 yrs & switched to lisinopril aprx 5-6 yrs ago. HBP & heart attack run in my family (dad & brother both had heart attacks at age 40). The heart palpitations (I call them summersaults in my chest) have caused me to go to the urgent care & doctor more than once. Have had EKGs twice in last 3 yrs, wore heart monitor, etc. Said I have irregular heart beat, but nothing to really worry about. I started on 5mg, but BP continued to increase. Raised to 10 mg, but same thing. Now up to 20 mg & BP is finally better (but not low) at 120/86. I HATE being tired all the time as I'm the kind of person who is always going. I'm going to talk w/Dr. & see about switching to something else again... Thanks to all for sharing!