Used for HIV

Are you tired of high medication costs? Our service offers unbeatable savings on your PREZISTA prescription medication. We provide a range of solutions to help you save up to 100% on your medication costs*. Whether you are insured, uninsured, underinsured, or simply looking to reduce your out-of-pocket expenses, we've got you covered.

Manufactured by Janssen Pharmaceuticals

*You can pay as little as $0 per fill using Drug Coupons or Patient Assistance Programs. Subject to applicability & eligibility requirements.

This content is intended for US audiences only

PREZISTA cost saving options available to you

  • Qualified

    Rx Advantage Card

    NowPatient's Rx Advantage card is a simple & convenient way to save money on your PREZISTA

    You can save up to 90%

  • Available

    Canadian Prescription Savings

    Manufactured by
    Powered by
    Buy your PREZISTA without insurance from Canada at discounts of up to 90% using NowPatient's Canadian Prescription savings program.
  • Available

    Drug Coupons

    Obtain your PREZISTA for as little as $0 per fill. Suitable for insured individuals only.

    You can pay as little as $0

  • Available

    Patient Assistance Programs

    Obtain your PREZISTA at no cost. Suitable for insured, underinsured and uninsured individuals

    You can receive for FREE


How it works

How to Lower Your Drug Costs

  • swoosh
    View programs

    View the savings programs that are available

  • swoosh
    Select program

    Pick the program that is suitable for you

  • swoosh

    If required, complete the online qualification check

  • swoosh
    Start Saving

    Enroll & Start Saving



Why Choose Our Service?

  • black dot icon

    Comprehensive Coverage

    Our service covers a wide range of medications, ensuring you can find savings on almost any prescription.

  • emoji icon

    Easy to Use

    Our website is user-friendly, allowing you to quickly find and apply discounts.

  • check icon

    Trusted by Many

    Thousands of users trust us to help them save on their medication costs every day.


Start Saving Today!

Lower the cost of your PREZISTA prescription

Join the many satisfied customers who have already benefited from our prescription discount service.

Jamie Winn NowPatientGreen tick
Updated on 26 Apr 2024

PREZISTA Uses, Side Effects, Interactions, Warnings & Dosing



PREZISTA is the brand name for darunavir and is available as an oral tablet and suspension.

What dosages is PREZISTA available in?

What dosages is PREZISTA available in?

PREZISTA is available as a 75 mg, 150 mg, 600 mg, and 800 mg oral tablet and a 100 mg/ml oral suspension.

What is PREZISTA used for?

What is PREZISTA used for?

  • PREZISTA is a protease inhibitor that is used in the treatment of HIV infection in people aged 3 years and older
How does PREZISTA work?

How does PREZISTA work?

PREZISTA is a protease inhibitor, which means it blocks a protein called protease. Normally, protease helps to process viral proteins so that the HIV virus can infect healthy cells. By blocking protease from working, PREZISTA prevents the virus from making copies of itself and spreading.

How do I take PREZISTA?

How do I take PREZISTA?

PREZISTA is typically dosed as follows:

  • Adults: The typical dose is 800 mg by mouth once a day taken together with 100 mg ritonavir (Norvir) and food
  • Children 3 years and older: The dose will depend on your child’s weight
  • 10 kg (22 lbs) to less than 15 kg (33 lbs): The dosage ranges from 350 mg to 490 mg by mouth once a day taken together with 64 mg to 96 mg ritonavir (Norvir) and food
  • 15 kg (33 lbs) to less than 30 kg (66 lbs): The typical dose is 600 mg by mouth once a day taken together with 100 mg ritonavir (Norvir) and food
  • 30 kg (66 lbs) to less than 40 kg (88 lbs): The typical dose is 675 mg by mouth once a day taken together with 100 mg ritonavir (Norvir) and food
  • 40 kg (88 lbs) and more: The typical dose is 800 mg by mouth once a day taken together with 100 mg ritonavir (Norvir) with food
  • Your dose might be different depending on the results of the drug-resistance test. Your dose might also be different if you’re pregnant
Is it safe for me to take PREZISTA?

Is it safe for me to take PREZISTA?

PREZISTA is a safe and effective treatment when used for FDA licensed indications. However, like all medications, they may give you unwanted side effects. You should always discuss potential side effects with your physician to ensure the medication is suitable and right for you. Co-administration of PREZISTA/ritonavir is contraindicated with drugs that
are highly dependent on CYP3A for clearance and for which elevated plasma concentrations are associated with serious and/or life-threatening events (narrow therapeutic index).

PREZISTA Common Side Effects

PREZISTA Common Side Effects

Common side effects of PREZISTA:

  • Diarrhea
  • Rash
  • Nausea
  • Headache
  • Stomach pain
  • Vomiting
  • Feeling weak
  • Indigestion
  • Swollen belly
  • Weight loss
PREZISTA Serious Side Effects

PREZISTA Serious Side Effects

Serious side effects are rare with PREZISTA. Contact your healthcare provider immediately if you experience any of the following.

  • Severe allergic reactions: facial swelling, hives, rash, itchy skin, blistering or peeling of skin, body aches, trouble breathing
  • Serious liver problems: nausea, vomiting, not feeling hungry, pain in the right side of the stomach, yellowing of the whites of the eyes or skin, dark-colored urine, light-colored stool
Effects of other drugs, drug classes and over-the-counter products on PREZISTA

Effects of other drugs, drug classes and over-the-counter products on PREZISTA

The following medications may interact with PREZISTA:

  • Co-administration of PREZISTA/ritonavir with other drugs can alter the concentrations of other drugs and other drugs may alter the concentrations of darunavir. The potential drug-drug interactions must be considered prior to and during therapy
Who makes PREZISTA?

Who makes PREZISTA?

Janssen Pharmaceuticals

Is PREZISTA safe in pregnancy?

Is PREZISTA safe in pregnancy?

The recommended dosage in pregnant patients is PREZISTA 600 mg taken with ritonavir 100 mg twice daily with food.
There is a pregnancy exposure registry that monitors pregnancy outcomes in women exposed to PREZISTA during pregnancy. Healthcare providers are encouraged to register patients by calling the Antiretroviral Pregnancy Registry (APR) 1-800-258-4263.


What to do if you missed your PREZISTA dose

The FDA's medical product safety reporting program for health professionals, patients and consumers.

Learn more about reporting side effects
dollar sign

Drug Savings Tips

Medical Disclaimer

NowPatient has taken all reasonable steps to ensure that all material is factually accurate, complete, and current. However, the knowledge and experience of a qualified healthcare professional should always be sought after instead of using the information on this page. Before taking any drug, you should always speak to your doctor or another qualified healthcare provider.

The information provided here about medications is subject to change and is not meant to include all uses, precautions, warnings, directions, drug interactions, allergic reactions, or negative effects. The absence of warnings or other information for a particular medication does not imply that the medication or medication combination is appropriate for all patients or for all possible purposes.

FAQ logo

Things to know

Now Patient Data Security

Data Security

Our Commitment to You.

Find out moreNow Patient Data SecurityNow Patient Data Security

What is NowPatient

Online Pharmacy & Telehealth

NowPatient is an online pharmacy & telehealth service that is available in the US and UK. Our service is FREE and packed with useful features that can help you save money on the cost of your medications, access virtual treatments, and provide tools that can help improve your overall health.  Get started today and benefit from medication reminders, private treatment plans, NHS online pharmacy, GP appointment booking, Rx savings card, Drug Coupons, US drug savings programs, health conditions information, Drug Information, genetic testing, home test kits, BMI Risks, Type 2 Diabetes Riskspollen meter, air quality monitor, and lots more!

A laptop screen displays a dashboard with various health metrics and notifications. Widgets include drug coupons, home health testing, genetic risk, diabetes risk, BMI, pollen meter, and air quality.


To improve the lives of everyone by making high-quality care accessible and convenient

We are here to improve lives. Our service gives you access to smart features and resources that can help empower you to take control of your health and improve your health outcomes. All this, in one place, for FREE. We strive to bring a fresh perspective to managing health. NowPatient can be accessed by downloading the App or using your web browser.

Download our app today

A collage showing a map with pharmacies, a questionnaire, medication details, and a person video chatting on a screen.

Can I trust NowPatient

Meet our medical team

We are a passionate group of clinicians and medical writers covering a broad range of specialities with experience operating in health systems in the United Kingdom & United States. Providing excellent care and advice is at the heart of everything we do. You can read more about our medical team by visiting the medical team page or learn more about how we curate content by visiting our editorial process

Your Questions Answered

For your peace of mind, we can answer your questions quickly

We have a comprehensive list of FAQ’s on each feature page. Alternatively, for broader questions around our service just click the button below.
Find your answers