Hi, I Had To Go To The Emegency Room A

hi, i had to go to the emegency room a wk ago on Thurs.... thought i was having a heart attack, turns out i had chest pains due to asthma. anyway, I was prescribed ranitidin. this drug gave me very bad thoughts and i had hallicunations. stopped taking it and the bad thoughts are gone plus hallicunation. what is in this drug that caused thisto happen to me ?