Season's greetings. I just got this medication for my son and I don't feel comfortable with the warning and much less with the side effects within it. What guaranty do we have that this medication wouldn't cause him some kind of bad illness? Y couldn't he just get a more simple antibiotic to cure his face and gum infection? My son is allergic to penicillin. Does this contain penicillin? Honestly, I don't trust clindamycin it is the first time that I ever heard of such. Can you please be more specific as to what kind of antibiotic is this.