Oral health effects of medications are typically buried in lengthy package inserts as dry mouth or oral changes without explanation of why these matter or what can be done. But the oral consequences of some common medications are clinically significant and worth knowing about.
Dry mouth: the most widespread medication effect
Over 400 medications list dry mouth as a side effect. The primary culprits are medications with anticholinergic activity which reduce parasympathetic nerve stimulation of salivary glands. Common drug classes with significant anticholinergic burden include antihistamines, tricyclic antidepressants, certain SSRIs and SNRIs, bladder medications, antispasmodics, and many antihypertensives. The oral consequences are significant and are covered in detail in our dry mouth article.
Gingival overgrowth from specific medications
Three drug classes cause a specific side effect of gum tissue overgrowth: calcium channel blockers particularly nifedipine, verapamil, and diltiazem; cyclosporine which is an immunosuppressant used in transplant patients; and phenytoin which is an anticonvulsant used for epilepsy. The gum overgrowth can be dramatic with tissue proliferating and partially covering the teeth creating a very difficult to clean environment that becomes secondarily infected. Management involves meticulous oral hygiene and in severe cases surgical removal of the excess tissue.
Tetracycline staining of developing teeth
Tetracycline antibiotics administered to children under 8 or to pregnant women during the second and third trimester incorporate into developing dental tissue and produce characteristic gray or brown discoloration. This is permanent intrinsic staining within the enamel and dentin that cannot be removed with whitening. The connection has been known since the 1960s and tetracyclines are generally contraindicated in pregnant women and young children for exactly this reason.
Bisphosphonates and osteonecrosis of the jaw
Bisphosphonate medications used for osteoporosis and cancer-related bone metastases inhibit osteoclast activity. When surgical trauma to the jaw is required after these medications the impaired bone remodeling response can lead to exposure of necrotic bone. Any patient on bisphosphonates or about to start them should discuss this with their dentist before any surgical procedure.
Managing medication-related oral effects
The most important step is telling your dentist about all medications you take including supplements and OTC medications. Your dentist can then adjust the care plan, increase cleaning frequency, prescribe appropriate preventive measures, and monitor for specific drug-related changes.
Educational content. Never discontinue prescribed medications for oral health reasons without discussing with your prescribing physician.
