Greetings! Thank you for the question. For your information, Klacid is a medication containing active ingredient of Penicillin which is a type of antibiotics. Even though this medication can be purchased from pharmacies over-the-counter, we highly suggest that you still refer to health professionals including the pharmacist regarding the suitability of the medication for your existing health status. Please click here to talk to our pharmacist in private for further inquiries. Thank you.