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INDINAVIR (Crixivan®) & RITONAVIR (Norvir®)

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INDINAVIR (Crixivan®) & RITONAVIR (Norvir®) For inquiries between 8am-10pm and for emergencies 24 hours call: 1-888-511-6222. Ambulatory Care Pharmacists: 604-806-8151 Please call two weeks in advance to book your pharmacy appointments with the receptionist at 604-806-8060. INDINAVIR (Crixivan®) & RITONAVIR (Norvir®) What is Indinavir? • A protease inhibitor used to inhibit the replication of the HIV virus in combination with other antiretroviral agents (ARV) • Available as 200 mg and 400 mg capsules What is Ritonavir? • A protease inhibitor used to inhibit the replication of the HIV virus in combination with other antiretroviral agents (ARV) or to increase blood levels of other protease inhibitors. • Available as a 100 mg tablet or a 100 mg soft gel capsule and a 80 mg/mL liquid Why am I taking these two protease inhibitors? ••• When indinavir and ritonavir are taken together, ritonavir will “boost” the level of indinavir and increase its effect. How do I take these? • There are several different dosing regimens currently being used. Your dosing regimen has been chosen for you and should not be changed unless advised by a health care professional. • Indinavir must be taken at the same time as ritonavir ••• When indinavir and ritonavir are taken together, they can be taken with or without food. If stomach upset occurs, take with food. ••• Swallow the capsules or tablets whole (do NOT chew) ••• Drink AT LEAST 1.5 litres of liquids (i.e. water, juice, milk, NOT caffeinated or alcoholic beverages) daily to prevent the occurrence of kidney stones. ••• Alcohol is not recommended for the first 4 weeks of therapy and should be used with caution thereafter Take indinavir and ritonavir every day as prescribed as missing doses can lead to the development of drug resistance. If you miss a dose, take it as soon as you remember. If it is close to your next scheduled dose, skip the missed dose and take your next dose at your next scheduled times. Missed doses (especially if just one drug in the combination) may lead to the virus becoming resistant to all of the antiretroviral drugs that you are taking, reducing or eliminating the effect of them against the virus. What should I expect? INDINAVIR • Generally well tolerated • Most bothersome effect: kidney stones (4%). Contact your doctor if you develop lower back pain or blood in your urine • Other effects include dry skin, ingrown toenails, fatigue, nausea, vomiting, diarrhea, rash, acid regurgitation, anorexia, dry mouth, back pain, headache, insomnia, dizziness, blurred vision, light headedness, taste disturbances and/or prickly skin RITONAVIR • Common side effects include nausea, diarrhea, vomiting, anorexia, abdominal pain, taste disturbances and abnormal sensations in the hands, feet or in and around the mouth. • Other effects may include headache, muscle weakness, fever, lightheadedness, insomnia and/or sweating Redistribution or accumulation of body fat, blood fat changes and/or diabetes may occur in patients receiving antiretroviral therapy. Your doctor or pharmacist can provide you with further information on this topic. WARNING: Protease inhibitors not only interact with each other, but may alter the level of other medications. Always check with the pharmacist (1-888-511-6222) or your doctor before starting any new therapies (prescription, non-prescription and herbal) to ensure the safety of the combination. This is important, as in some cases the combination may result in serious and/or life-threatening complications. Medications that may require dosage adjustment or an alternative treatment, include: Some anti-histamines, sedatives, anti-tuberculosis medications, anti-fungal medications, narcotic analgesics, methadone, heart/blood-pressure medications, psychiatric medications, anti-convulsants, transplant/immunosuppressant medications, warfarin, cholesterol lowering agents, sildenafil (Viagra®), oral contraceptives (birth control pill), ergot containing migraine medications. Avoid the following Herbal/Natural remedies: St. John’s Wort, Milk Thistle, Garlic, as these may decrease levels of protease inhibitors. How do I store these? • Indinavir should be stored in a cool, dry place at room temperature (15-30 degrees C) in the original container, with a desiccant. • Ritonavir capsules should be stored in the refrigerator (2-8 degrees C), but are stable at room temperature (less than 25 degrees C) for thirty days. Keep ritonavir capsules away from excessive heat and protected from light. • Ritonavir tablets and liquid should NOT be stored in the refrigerator. Store at room temperature (20-25 degrees C) in its original container, tightly sealed, away from excessive heat and protected from light. • Store all medication out of the reach of children. Labwork to be done: CBC with differential, liver enzymes, fasting glucose and lipid panel, serum creatinine, urinalysis, plasma viral load, CD4 count January 2011 .
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