Doxycycline Monohydrate Tablets

  • Bacterial infections

Doxycycline Monohydrate Tablets Generic Name & Formulations

General Description

Doxycycline monohydrate 50mg, 100mg; tabs.

Pharmacological Class

Tetracycline antibiotic.

How Supplied

Tabs 50mg—100; 100mg—50, 250


Doxycycline Monohydrate Tablets Indications


Tetracycline-susceptible infections including respiratory, genitourinary, rickettsial, trachoma. Postexposure prophylaxis and treatment of anthrax.

Doxycycline Monohydrate Tablets Dosage and Administration


Usual dose: 200mg on first day (give as 100mg every 12hrs or 50mg every 6hrs) followed by maintenance dose of 100mg/day (may be given as a single dose or as 50mg every 12hrs). Management of severe infections (including chronic UTI): 100mg every 12hrs. Uncomplicated gonoccal infections (except anorectal infections in men): 100mg twice daily for 7 days or 300mg stat followed in one hour by a second 300mg dose. Acute epididymo-orchitis caused by N. gonorrhoeae, C. trachomatis: 100mg twice daily for at least 10 days. Primary and secondary syphilis: 300mg in divided doses for at least 10 days. Uncomplicated urethral, endocervical, or rectal infection caused by C. trachomatis, nongonococcal urethritis caused by C. trachomatis and U. urealyticum: 100mg twice daily for at least 7 days. Inhalational anthrax (post-exposure): 100mg twice daily for 60 days.


<8yrs: not recommended. >8yrs: ≤100lbs: 2mg/lb divided into two doses on the first day, followed by 1mg/lb as a single daily dose or divided into two doses, on subsequent days. Severe infections: up to 2mg/lb may be used. >100lbs: use adult dose. Inhalational anthrax (post-exposure): ≤100lbs: 1mg/lb twice daily for 60 days. >100lbs: use adult dose.

Doxycycline Monohydrate Tablets Contraindications

Not Applicable

Doxycycline Monohydrate Tablets Boxed Warnings

Not Applicable

Doxycycline Monohydrate Tablets Warnings/Precautions


Monitor blood, renal, and liver function in long-term use. Avoid excessive sunlight or UV light. Pregnancy (Cat.D), nursing mothers: not recommended.

Doxycycline Monohydrate Tablets Pharmacokinetics

See Literature

Doxycycline Monohydrate Tablets Interactions


Antacids, iron, zinc, calcium, magnesium reduce absorption. Avoid concomitant penicillin, methoxyflurane. Carbamazepine, phenytoin, barbiturates may decrease effectiveness. Monitor prothrombin time with oral anticoagulants. May decrease effectiveness of oral contraceptives.

Doxycycline Monohydrate Tablets Adverse Reactions

Adverse Reactions

Photosensitivity, GI upset, esophageal irritation/ulceration (drink fluids liberally with dose), rash, increased BUN, hypersensitivity reactions, blood dyscrasias; pseudomembranous colitis.

Doxycycline Monohydrate Tablets Clinical Trials

See Literature

Doxycycline Monohydrate Tablets Note

Not Applicable

Doxycycline Monohydrate Tablets Patient Counseling

See Literature