Yes, it is safe to take doxycycline if you are allergic to penicillin.
Marvell is correct.
Penicillin belongs to a class of drugs called beta-lactam antibiotics. These drugs include penicillin and amoxicillin. They are used to treat many common bacterial infections including skin, ear, sinus and upper respiratory infections.
Penicillin allergy is an overreaction by your immune system to penicillin and other antibiotics in the beta-lactam family and closely related antibiotics.
Doxycycline belongs to a class of drugs called Tetracyclines. Tetracyclines are unrelated to penicillins and therefore safe to take in hypersensitive patients. Other unrelated antibiotics include quinolones (e.g. ciprofloxacin), macrolides (e.g. clarithromycin), aminoglycosides (e.g. gentamicin) and glycopeptides (e.g. vancomycin).
- Doxycycline Information for Consumers
- Doxycycline Information for Healthcare Professionals (includes dosage details)
- Side Effects of Doxycycline (detailed)
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