Any of a large group of antibiotics with a molecular structure containing four rings.
- This strain was resistant to methicillin, cephalothin, gentamicin, erythromycin, chloramphenicol and tetracycline.
- Moderate acne is often successfully treated with a low-dose oral antibiotic, such as tetracycline or erythromycin.
- He was treated with a six-month course of a tetracycline and made a slow and steady recovery.
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