Common Uses:Off Label Uses:Side Effects:
Signs of renal damage - nausea, abdominal discomfort, low fever, loss of appetite, dark urine, clay-colored stools, jaundice (yellowing of the skin or eyes);
Urinating less than usual or not at all;
Fever, chills, body aches, flu symptoms;
Unusual thoughts or behavior, severe depression, extreme fear, thoughts of hurting oneself or others, hallucinations;
Severe blistering, peeling, and red skin rash; or
Seizure (convulsions).

Cautions / Warnings:Drug Interactions:
Acyclovir (Zovirax), ganciclovir (Cytovene), valacyclovir (Valtrex), or valganciclovir (Valcyte);
Sertraline (Zoloft);
Methadone (Methadose);
Adefovir (Hepsera) or cidofovir (Vistide);
Anti-coagulants such as warfarin (Coumadin);
Cholesterol medications such as atorvastatin (Lipitor), pravastatin (Pravachol), or simvastatin (Zocor);
Antibiotics such as clarithromycin (Biaxin), itraconazole (Sporanox), ketoconazole (Nizoral), rifabutin (Mycobutin), rifampin (Rifater, Rifamate);
A calcium channel blocker such as amlodipine (Norvasc), diltiazem (Tiazac, Cartia, Cardizem), felodipine (Plendil), nifedipine (Procardia, Adalat), verapamil (Calan, Covera, Isoptin, Verelan), and others.