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RIFAXIMIN (Xifaxan®)
Usual dose
Adult: 200-400 mg Q8H PO (UWHC cost/day $24.06-48.12)
1. Travelers’ diarrhea.
2. Reduction of the risk of recurrence of overt hepatic encephalopathy (NOT approved for treatment)
In the limited studies that have been done with Rifaximin in the reduction of the risk of recurrence of overt hepatic
encephalopathy, the most effective dose was found to be 600 mg Q12H. However, it was not possible to manufacture a
tablet this large; the largest tablet that could be manufactured was a 550 mg tablet. This was the tablet that was used in
the pivotal trial for FDA approval for the hepatic encephalopathy indication, but this dose is not the optimal dose for this
For up-to-date information on the use of antiretrovirals, consult an HIV expert or
For up-to-date information on the use of antiretrovirals, consult an HIV expert or
No longer available in the U.S.
For up-to-date information on the use of antiretrovirals, consult an HIV expert or
Usual Dose
Adult: 15 mg/kg/day (max 1 g) or 20-40 mg/kg (max 1.5 g) two or three times per week IM (UWHC cost/day $10.1515.22).
1. Mycobacterium tuberculosis – initial treatment in combination with isoniazid, rifampin and pyrazinamide in situations
where ethambutol is contraindicated or ineffective (see Appendix E).
2. Streptococcal or enterococcal endocarditis caused by high-level gentamicin-resistant but streptomycin-sensitive strains.
3. Plague, tularemia, or brucellosis.
Monitor serum drug levels (test must be sent out). Use extreme caution and reduce dose when prescribing for patients
with renal insufficiency.
Usual Dose
Adult: Load 2-4 g PO; Maintenance 500 mg-2 g Q6H PO (UWHC cost/day $7.40-29.62).
Pediatric:** 120 - 150 mg/kg/day PO in divided doses Q4-6H.
1. Toxoplasmosis - treatment of choice. Use in combination with pyrimethamine (1-1.5 g Q6H PO for 3-6 weeks, then 1 g
BID PO for maintenance dosing).
Sulfadiazine is not recommended for use in infants less than 2 months of age with the exception of congenital
toxoplasmosis treatment (in combination with pyrimethamine) where the benefit might exceed the risk. Do not confuse
with sulfasalazine.