Therapeutic Classification: anti-infectives
Pharmacologic Classification: tetracyclines
Absorption: Well absorbed from the GI tract.
Distribution: Widely distributed, some CSF and good bone penetration.
Metabolism/Excretion: 2040% excreted unchanged in urine; some inactivation in intestine and some enterohepatic circulation with excretion in bile and feces.
Half-life: 1417 hr (↑ in severe renal impairment).
Derm: photosensitivity, DRUG RASH WITH EOSINOPHILIA AND SYSTEMIC SYMPTOMS (DRESS), ERYTHEMA MULTIFORME, EXFOLIATIVE DERMATITIS, rash, STEVENS-JOHNSON SYNDROME, TOXIC EPIDERMAL NECROLYSIS.
GI: diarrhea, nausea, vomiting, CLOSTRIDIOIDES DIFFICILE-ASSOCIATED DIARRHEA (CDAD), dysphagia, esophagitis, glossitis, HEPATOTOXICITY, PANCREATITIS.
Hemat: blood dyscrasias.
Local: phlebitis at IV site.
Neuro: headache, intracranial hypertension.
Misc: hypersensitivity reactions, superinfection.
Do not substitute Doryx MPC with other formulations of doxycycline. Doryx MPC 60 mg is equivalent to Doryx 50 mg; Doryx 120 mg is equivalent to Doryx 100 mg.
More Common Infections
- PO (Adults and Children >8 yr and >45 kg): Most infections: 100 mg every 12 hr on the 1st day, then 100200 mg once daily or 50100 mg every 12 hr; Doryx MPC: 120 mg every 12 hr on the 1st day, then 120 mg once daily or 60 mg every 12 hr; Gonorrhea: 100 mg every 12 hr for 7 days or 200 mg once daily for 7 days (delayed-release tablets) or 300 mg followed 1 hr later by another 300-mg dose; Doryx MPC: 120 mg every 12 hr for 7 days or 360 mg followed 1 hr later by another 360mg dose; Uncomplicated urethral, endocervical, or rectal infection caused by Chlamydia trachomatis: 100 mg every 12 hr for 7 days; Doryx MPC: 120 mg every 12 hr for 7 days; Syphilis (early): 100 mg every 12 hr for 14 days; Doryx MPC: 120 mg every 12 hr for 14 days; Syphilis (>1 yr duration): 100 mg every 12 hr for 4 wk; Doryx MPC: 120 mg every 12 hr for 4 wk; Malaria prophylaxis: 100 mg once daily (2 mg/kg once daily for children > 8 yr); Doryx MPC: 120 mg once daily; Lyme disease: 100 mg twice daily; Periodontitis20 mg twice daily; Rosacea: 40 mg once daily in morning.
- PO (Children >8 yr and <45 kg): Less severe infections: 2.2 mg/kg every 12 hr on the 1st day, then 2.24.4 mg/kg once daily or 1.12.2 mg/kg every 12 hr; Doryx MPC: 2.6 mg every 12 hr on the 1st day, then 2.6 mg/kg once daily or 1.3 mg/kg every 12 hr.
- PO (Children >45 kg): Severe or life-threatening infections (Rocky Mountain Spotted Fever): 100 mg every 12 hr; Doryx MPC: 120 mg every 12 hr.
- PO (Children <45 kg): Severe or life-threatening infections (Rocky Mountain Spotted Fever): 2.2 mg/kg every 12 hr; Doryx MPC: 2.6 mg/kg every 12 hr.
Inhalational Anthrax (Postexposure)
- PO, IV (Adults and Children >45 kg): 100 mg IV every 12 hr; change to 100 mg PO every 12 hr when clinically appropriate for a total of 60 days; one or two other anti-infectives may be added initially, depending on clinical situation; Doryx MPC: 120 mg PO every 12 hr for 60 days.
- PO, IV (Children 45 kg): 2.2 mg/kg IV every 12 hr; change to 2.2 mg/kg PO every 12 hr when clinically appropriate for a total of 60 days; one or two other anti-infectives may be added initially, depending on clinical situation; Doryx MPC: 2.6 mg/kg PO every 12 hr for 60 days.
Cutaneous anthrax
- PO (Adults): 100 mg every 12 hr for 60 days; some patients may require IV therapy initially depending on clinical situation.
- PO (Children >8 yr and >45 kg): 100 mg every 12 hr; some patients may require IV therapy initially depending on clinical situation.
- PO (Children >8 yr and 45 kg): 2.2 mg/kg every 12 hr; some patients may require IV therapy initially depending on clinical situation.
- PO (Children 8 yr): 2.2 mg/kg every 12 hr; some patients may require IV therapy initially depending on clinical situation.
Acticlate, Doryx, Doryx MPC, Doxy, Oracea, Vibramycin
Apprilon, Doxycin, Doxytab, Periostat