April 28, 2017
Recommended Topic Related To:


"Entry Inhibitors (including Fusion Inhibitors) and CCR5 Co-receptor Antagonist

Entry Inhibitors
Entry inhibitors block HIV entry into CD4+ cells.

Fusion inhibitors
The only drug in this class "...



(nelfinavir mesylate) Tablets and Powder for Oral Use


VIRACEPT® (nelfinavir mesylate) is an inhibitor of the human immunodeficiency virus type 1 (HIV-1) protease. VIRACEPT Tablets are available for oral administration as a light-blue, capsule-shaped tablet with a clear film coating in 250 mg strength (as nelfinavirfree base) and as a white oval tablet with a clear film coating in 625 mg strength (as nelfinavir-free base). Each tablet contains the following common inactive ingredients: calcium silicate, crospovidone, magnesium stearate, hypromellose, and triacetin. In addition, the 250 mg tablet contains FD&C blue #2 powder and the 625 mg tablet contains colloidal silicon dioxide. VIRACEPT Oral Powder is available for oral administration in a 50 mg/g strength (as nelfinavir-free base) in bottles. The oral powder also contains the following inactive ingredients: microcrystalline cellulose, maltodextrin, dibasic potassium phosphate, crospovidone, hypromellose, aspartame, sucrose palmitate, and natural and artificial flavor. The chemical name for nelfinavir mesylate is [3S-[2(2S*, 3S*), 3α,4aβ,8aβ]]-N-(1,1-dimethylethyl)decahydro-2-[2-hydroxy-3-[(3-hydroxy-2-methylbenzoyl)amino]-4-(phenylthio)butyl]-3- isoquinoline carboxamide mono-methanesulfonate (salt) and the molecular weight is 663.90 (567.79 as the free base). Nelfinavir mesylate has the following structural formula:

VIRACEPT® (nelfinavir mesylate) Structural Formula Illustration

Nelfinavir mesylate is a white to off-white amorphous powder, slightly soluble in water at pH ≤ 4 and freely soluble in methanol, ethanol, 2-propanol and propylene glycol.

What are the possible side effects of nelfinavir (Viracept)?

Get emergency medical help if you have any of these signs of an allergic reaction: hives; difficulty breathing; swelling of your face, lips, tongue, or throat.

Stop using nelfinavir and call your doctor at once if you have a serious side effect such as:

  • signs of a new infection, such as fever, chills, body aches, flu symptoms, sores in your mouth and throat;
  • high blood sugar (increased thirst, increased urination, hunger, dry mouth, fruity breath odor, drowsiness, dry skin, blurred vision, weight loss);
  • pale skin, feeling light-headed or short of...

Read All Potential Side Effects and See Pictures of Viracept »

What are the precautions when taking nelfinavir mesylate (Viracept)?

Before taking nelfinavir, tell your doctor or pharmacist if you are allergic to it; or if you have any other allergies. This product may contain inactive ingredients, which can cause allergic reactions or other problems. Talk to your pharmacist for more details.

Before using this medication, tell your doctor or pharmacist your medical history, especially of: diabetes, heart problems (coronary artery disease, heart attack), lipid problems (high cholesterol or triglycerides/fats), hemophilia, liver problems.

Before having surgery, tell your doctor or dentist about all the products you use (including prescription drugs, nonprescription drugs, and herbal products).

Children may be more sensitive to the side effects of this drug, especially diarrhea or rash.


Read All Potential Precautions of Viracept »

Last reviewed on RxList: 4/27/2015
This monograph has been modified to include the generic and brand name in many instances.

Viracept - User Reviews

Viracept User Reviews

Now you can gain knowledge and insight about a drug treatment with Patient Discussions.

Here is a collection of user reviews for the medication Viracept sorted by most helpful. Patient Discussions FAQs

Report Problems to the Food and Drug Administration


You are encouraged to report negative side effects of prescription drugs to the FDA. Visit the FDA MedWatch website or call 1-800-FDA-1088.

WebMD Daily

Get breaking medical news.