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Doxycycline is a prescription tetracycline-class antibacterial used for numerous infections caused by susceptible organisms. Products include doxycycline monohydrate and doxycycline hyclate in different oral formulations. Standard antibacterial capsules treat rickettsial, respiratory, sexually transmitted, and other bacterial infections, while certain formulations have separate indications such as rosacea.
read more about doxycycline ...Doxycycline binds to the bacterial 30S ribosomal subunit and inhibits protein synthesis. Its antibacterial activity is primarily bacteriostatic, which means it stops susceptible bacteria from multiplying rather than directly destroying them. Resistance mechanisms can reduce activity, and cross-resistance with other tetracyclines is common.
Standard antibacterial doxycycline formulations treat selected rickettsial infections, respiratory infections, sexually transmitted infections, ophthalmic infections, anthrax, plague, tularemia, cholera, and other susceptible bacterial infections. Doxycycline is also used as an alternative for selected infections when penicillin is contraindicated and for malaria prophylaxis under formulation-specific labeling.
For standard antibacterial capsules, adults commonly receive 200 mg on the first day as 100 mg every 12 hours, followed by 100 mg daily. More severe infections use 100 mg every 12 hours. Pediatric dosing depends on age, body weight, infection severity, and the specific condition being treated.
Doxycycline can cause permanent tooth discoloration during tooth development, reversible inhibition of bone growth, photosensitivity, esophagitis, esophageal ulceration, Clostridioides difficile-associated diarrhea, intracranial hypertension, severe skin reactions, and hypersensitivity. Use in children age 8 or younger is reserved for severe or life-threatening infections when the expected benefit outweighs these risks.
Yes. Doxycycline is a tetracycline-class antibacterial medicine.
A common regimen is 200 mg on day 1 followed by 100 mg daily, with higher-frequency dosing for more severe infections.
Yes. Adequate fluid reduces the risk of esophageal irritation and ulceration with oral capsules and tablets.
Yes. Photosensitivity and exaggerated sunburn reactions have been reported with doxycycline and other tetracyclines.
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DailyMed - DOXYCYCLINE MONOHYDRATE capsule. https://www.dailymed.nlm.nih.gov/dailymed/drugInfo.cfm?setid=02aa8731-d40f-43d8-8b63-a79a0503f8db. Date Accessed September 25, 2026.
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