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Does Nelfinavir Interact with Fosamprenavir Calcium?

CDI records a unknown classification for Nelfinavir and Fosamprenavir Calcium. The stored summary is: Fosamprenavir calcium/ritonavir: ↓ Atazanavir ↔ Amprenavir HIV protease inhibitors: Indinavir a , nelfinavir a Fosamprenavir calcium: ↑ Amprenavir Effect on indinavir and nelfinavir is not well established. Patients taking both medications should consult their healthcare provider before starting, stopping, or changing the dosage of either drug. This record was extracted from drug labeling through openFDA. NIH/NLM RxNorm is used for drug identities. The summary and severity classification are CDI's processed information, not a verbatim source quotation. Product, route, and patient circumstances matter.

Severity: Unknown
Management: Consult your pharmacist
Data Source: U.S. FDA via OpenFDA

What To Tell Your Doctor or Pharmacist

If you are taking Nelfinavir and your doctor is considering prescribing Fosamprenavir Calcium (or vice versa), make sure to:

Inform your doctor and pharmacist of all current medications, including over-the-counter drugs and supplements
Ask whether the benefits of combining these medications outweigh the risks for your specific situation
Ask what symptoms to watch for that would indicate the interaction is causing problems
Never stop or change either medication without first consulting your healthcare provider

💊 Nelfinavir(Viracept)+💊 Fosamprenavir Calcium(Fosamprenavir Calcium)

Severity & Interaction Details

ℹ️

unknown

Interaction documented — severity unclassified

The CDI record includes an interaction but its severity has not been classified.

Severity scale

MinorContra

On record

Yes

Drug A class

—

Drug B class

—

Source

FDA drug label - fosamprenavir calcium

What this means in plain English

Fosamprenavir calcium/ritonavir: ↓ Atazanavir ↔ Amprenavir HIV protease inhibitors: Indinavir a , nelfinavir a Fosamprenavir calcium: ↑ Amprenavir Effect on indinavir and nelfinavir is not well established.

About Nelfinavir and Fosamprenavir Calcium

Nelfinavir is also sold under the brand name Viracept.

Source and Limitations

This record was produced by automated extraction from drug-label information, including AI processing. The summary and mechanism are not verbatim FDA quotations. The drug profiles below may describe different formulations from the source label. Confirm the exact product and route with your pharmacist. This page does not establish independent clinical review.

📖 Source: FDA drug label - fosamprenavir calcium

Recent research & FDA safety updates

Live

Auto-aggregated from PubMed E-utilities and FDA safety data.

PubMed

A Priori Design, Combinatorial Synthesis, and Assessment of an Antipackaging Peptide Against Human Immunodeficiency Virus 1: Functional Role of Unnatural Trp Mimetics and Serendipitous Discovery of a Protease Inhibitor.about Nelfinavir · 2026-07

PubMed

Betulinaldehyde Ameliorates Aβ-Induced Neurotoxicity and Cognitive Deficits by Modulating the eEF2K/eEF2 Pathway.about Nelfinavir · 2026-07

PubMed

Non-Canonical Binding of Nelfinavir in HIV-1 Protease Variants Reveals Structural Mechanisms of Antiretroviral Resistance.about Nelfinavir · 2026-06

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How this information is prepared: CDI uses automated extraction, including AI, to summarize drug labeling from openFDA and includes separately identified curated-reference records. RxNorm helps identify medications; it does not verify interaction claims. Extracted summaries and CDI severity classifications can contain errors and are not verbatim FDA statements or independent clinical review. Maintained by CheckDrugInteractions.com. See our methodology or report a correction at support@checkdruginteractions.com.

Data sourced from U.S. FDA drug labeling via openFDA and the NIH National Library of Medicine, supplemented with a small number of well-established interactions from curated clinical references. For informational purposes only. Always consult your pharmacist or physician.