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Lexiva (fosamprenavir) Disease Interactions

There are 4 disease interactions with Lexiva (fosamprenavir):

Major

Pis (Includes Lexiva) ↔ Hemophilia

Severe Potential Hazard, Low plausibility

Applies to: Coagulation Defect

There have been postmarketing reports of increased bleeding, including spontaneous skin hematomas and hemarthrosis, in types A and B hemophiliac patients treated with protease inhibitors. However, a causal relationship has not been established. In some patients, additional Factor VIII was given. In more than half of the reported cases, protease inhibitor therapy was continued or reintroduced following an interruption. Hemophiliacs and patients with other coagulation defects should be monitored closely for bleeding during protease inhibitor therapy.

References

  1. "Product Information. Crixivan (indinavir)." Merck & Co, Inc, West Point, PA.
  2. "Product Information. Kaletra (lopinavir-ritonavir)" Abbott Pharmaceutical, Abbott Park, IL.
  3. "Product Information. Agenerase (amprenavir)." Glaxo Wellcome, Research Triangle Pk, NC.
View all 10 references
Moderate

Fos-/Amprenavir (Includes Lexiva) ↔ Nephrolithiasis

Moderate Potential Hazard, Moderate plausibility

Applies to: Dehydration, Nephrolithiasis, History - Nephrolithiasis

Cases of nephrolithiasis have been reported during postmarketing surveillance in HIV-infected patients receiving amprenavir or fosamprenavir therapy. Because these events were reported voluntarily during clinical practice, estimates of frequency cannot be made. Therapy with amprenavir or fosamprenavir should be administered cautiously in patients with a current or past history of nephrolithiasis. Adequate hydration is recommended. Those who are dehydrated may be at increased risk and should be encouraged to consume additional amounts of liquid or given intravenous fluids if necessary. Patients should be instructed to seek medical attention if they experience potential signs and symptoms of urolithiasis such as flank pain, hematuria, dysuria, and urinary urgency. Temporary interruption or discontinuation of therapy may be required.

Moderate

Pis (Includes Lexiva) ↔ Hyperglycemia

Moderate Potential Hazard, Moderate plausibility

Applies to: Abnormal Glucose Tolerance, Diabetes Mellitus

New onset or exacerbation of preexisting diabetes mellitus, glucose intolerance, and hyperglycemia have been reported during postmarketing surveillance in HIV patients treated with protease inhibitors (PIs). Frequently, insulin resistance may accompany fat redistribution and serum lipid elevations in what is collectively termed the HIV-associated lipodystrophy syndrome. Although a causal relationship has not been established, these metabolic disturbances have most often occurred in HIV patients during treatment with potent antiretroviral regimens containing PIs. Patients with or predisposed to glucose disorders should be monitored during PI therapy. Dosage adjustments in insulin or oral hypoglycemic medications may be necessary in patients with diabetes. In some cases, glucose abnormalities persisted despite discontinuation of PI therapy.

References

  1. Hardy H, Esch LD, Morse GD "Glucose disorders associated with HIV and its drug therapy." Ann Pharmacother 35 (2001): 343-51
  2. "Product Information. Viracept (nelfinavir)." Agouron Pharma Inc, La Jolla, CA.
  3. "Product Information. Invirase (saquinavir)." Roche Laboratories, Nutley, NJ.
View all 22 references
Moderate

Pis (Includes Lexiva) ↔ Hyperlipidemia

Moderate Potential Hazard, High plausibility

Applies to: History - Myocardial Infarction, Hyperlipidemia, Ischemic Heart Disease

Hyperlipidemia have been observed in 10% of patients receiving ritonavir during clinical trials. Increases of 30% to 40% from baseline have been reported for total cholesterol and 200% to 300% or more for triglycerides. These effects have also been reported during postmarketing experience with other protease inhibitors (PIs) but may be the most dramatic with ritonavir. The clinical significance of these elevations is unclear. Severe hyperlipidemia is known to sometimes cause pancreatitis. In addition, some patients have reportedly developed symptomatic atherosclerosis and coronary artery disease after initiating PI treatment. Patients with preexisting hyperlipidemia may require closer monitoring during PI therapy, and adjustments made accordingly in their lipid-lowering regimen. PI therapy should be administered cautiously in patients with coronary artery disease or a history of ischemic heart disease.

References

  1. "Product Information. Lexiva (fosamprenavir)." GlaxoSmithKline, Research Triangle Park, NC.
  2. "Product Information. Agenerase (amprenavir)." Glaxo Wellcome, Research Triangle Pk, NC.
  3. "Product Information. Invirase (saquinavir)." Roche Laboratories, Nutley, NJ.
View all 19 references

Lexiva (fosamprenavir) drug Interactions

There are 518 drug interactions with Lexiva (fosamprenavir)

Lexiva (fosamprenavir) alcohol/food Interactions

There are 2 alcohol/food interactions with Lexiva (fosamprenavir)

Drug Interaction Classification

The classifications below are a general guideline only. It is difficult to determine the relevance of a particular drug interaction to any individual given the large number of variables.

Major Highly clinically significant. Avoid combinations; the risk of the interaction outweighs the benefit.
Moderate Moderately clinically significant. Usually avoid combinations; use it only under special circumstances.
Minor Minimally clinically significant. Minimize risk; assess risk and consider an alternative drug, take steps to circumvent the interaction risk and/or institute a monitoring plan.

Do not stop taking any medications without consulting your healthcare provider.

Disclaimer: Every effort has been made to ensure that the information provided by Multum is accurate, up-to-date and complete, but no guarantee is made to that effect. In addition, the drug information contained herein may be time sensitive and should not be utilized as a reference resource beyond the date hereof. This material does not endorse drugs, diagnose patients, or recommend therapy. Multum's information is a reference resource designed as supplement to, and not a substitute for, the expertise, skill, knowledge, and judgement of healthcare practitioners in patient care. The absence of a warning for a given drug or combination thereof in no way should be construed to indicate that the drug or combination is safe, effective, or appropriate for any given patient. Multum Information Services, Inc. does not assume any responsibility for any aspect of healthcare administered with the aid of information Multum provides. Copyright 2000-2016 Multum Information Services, Inc. The information contained herein is not intended to cover all possible uses, directions, precautions, warnings, drug interactions, allergic reactions, or adverse effects. If you have questions about the drugs you are taking, check with your doctor, nurse, or pharmacist.

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