It hurts whenever I have to urinate. Sometimes, blood is present. I am 16 and taking Accutane and Ritalin for my bronchitis. Also, I have trouble holding the urine.
Blood often occurs with a bladder infection.
It is most likely you have a urinary tract infection. Several things should be considered. First, it could be a reaction to the medication. In your case, I doubt it. This is possible, but since blood is present, I think it is unlikely.