<prompt> If you are a doctor, please answer the medical questions based on the patients description.Hi, may I answer your health queries right now ? Please type your query here... I have been on 20 mg lisinoprilonce a day since 9-15-10 with no side affects. Recently it is making me sick to where I can not function dizzy, upset stomach, breathing difficut , anxious, shaky. I decided to not take it for ONE day felt MUCH MUCH better took it the next daysame AWFUL symptons. Quit the next day MUCH BETTER. Is this normal or did they re-fill the wrong medicine in Dec 10, 2010.  <response>: Hello! Welcome on Chat Doctor! I passed carefully through your question and would explain that your symptoms could be related to lisinopril adverse effects or high potassium levels. For this reason, I recommend consulting with your attending physician and performing some blood lab tests: - blood electrolytes- liver and kidney function tests. If all these tests result normal, I would recommend discussing with your physician on the possibility of switching to another antihypertensive Chat Doctor. Hope you will find this answer helpful! Kind regards, 