... experiencing symptoms? I took my medication (prescription medicine that fights parasite infections) last friday and still experienced itching this morning (Wednesday) The doctor who prescribed my medication expressed hat she was not entirely sure that I had pin worms but my symptoms seemed to match. So, I'm thinking... if it hasn't worked by now, maybe its not pinworms. I've also noticed that my anti-itch creams are less effective. I'm currently out of town and I'm thinking of having another dose sent out to me just in case. The doctor also mentioned that it could take two doses of medicine to get rid of the parasites so, perhaps I just need one more dose? Is it a major problem if I take another dose if I do not in fact have pin worms?