Insomnia, dizziness, headache, nausea, weakness, back pain, problems with balance, MS relapse, burning, tingling, or itching of skin, irritation in your nose or throat, constipation, indigestion, pain in your throat. UTI


No side effects when I took compounded 4-AP but noticed when I brushed and spit some blood in sink I thought was coming out of throat. Not a lot, not irritating (didn't know it was there until I spit) and as it didn't seem to help at all, I stopped after trying a month +. Very slight indigestion.