Sure it is possible for medications to leak smell through skin just like garlic on humans, but chances are he just a stinky man rat who needs a bath. I have always had male rats till this year and all had a distinct smell, but my King George II smells incredibly manly. Males release what is called buck grease and sometimes it can be very, very stinky like my George, and on others it's not bad. Give him a good bath, he may fuss, but I always found that when you put water in the tub, fold a towel and put in tub on far end and set him on towel, and he will get curious and dip his toes, then move in for the cleaning attack
