I think I must be over reacting to everything at the mome because finding giving my lad 500mg of penicillin every 6 hours on empty stomach worrying and difficult . it seems a high dose he's 16 for tonsillitis and for 10 days . hope someone can ease my worry a that I am doing this right ! I give it a 8am 1pm 7pm and midnight (he's always awake )