Rifapentine: Uses, Dosage, Side Effects & Key Information

Summary of Key Points

Rifapentine is an antibiotic used to treat various forms of tuberculosis (TB) and other bacterial infections. It works by stopping the growth of bacteria in the body. Rifapentine is often combined with other medications to ensure the infection is fully treated. It’s essential to take this medication exactly as prescribed to prevent drug resistance. Always consult a healthcare provider before starting or adjusting your dose.

Names of Medication

US Brand Name: Priftin

Generic Name: Rifapentine

The generic name refers to the active ingredient, while the brand name is given by the manufacturer. In this article, the generic name will be shown in parentheses.

Pharmacologic Category

Antitubercular Agent

Rifamycin Antibiotic

Dosing Information for Rifapentine

Rifapentine is prescribed for conditions such as tuberculosis and other bacterial infections. The dosage and duration of treatment depend on the specific condition being treated. Always follow your healthcare provider’s instructions and consult them before making any changes. You can also schedule a telemedicine appointment for personalized advice.

Tuberculosis (Active Pulmonary TB)

600 mg orally twice weekly for 2 months, followed by 600 mg once weekly for 4 months, in combination with other TB medications.

Latent Tuberculosis Infection (LTBI)

900 mg orally once weekly for 12 weeks, in combination with isoniazid.

Extrapulmonary Tuberculosis

600 mg orally twice weekly for 2 months, followed by 600 mg once weekly for 4 months, in combination with other TB medications.

Drug-resistant Tuberculosis

Consult your healthcare provider for specific dosing recommendations, as this condition requires a specialized treatment plan.

HIV-associated Tuberculosis

600 mg orally twice weekly for 2 months, followed by 600 mg once weekly for 4 months, in combination with other TB medications. Close monitoring is required due to potential drug interactions with HIV medications.

Miliary Tuberculosis

600 mg orally twice weekly for 2 months, followed by 600 mg once weekly for 4 months, in combination with other TB medications.

Chronic Cough due to Tuberculosis

600 mg orally twice weekly for 2 months, followed by 600 mg once weekly for 4 months, in combination with other TB medications.

Dosage Forms and Strengths of Rifapentine

Tablet: 150 mg

Administration Instructions for Rifapentine

Rifapentine should be taken with food to improve absorption and reduce the risk of stomach upset. Swallow the tablet whole with a full glass of water. It’s important to take Rifapentine at the same time each day to maintain consistent levels in your body. If you miss a dose, take it as soon as you remember, but do not double up. Always complete the full course of treatment, even if you start feeling better, to prevent the development of drug-resistant bacteria.

Adverse Reactions and Side Effects of Rifapentine

Like all medications, Rifapentine can cause side effects. While not everyone will experience them, it’s important to be aware of potential reactions. If you experience severe or concerning symptoms, contact your healthcare provider immediately or schedule a telemedicine appointment.

Common Side Effects (1-10%)

1. Nausea: Feeling sick to your stomach.
2. Vomiting: Throwing up.
3. Loss of appetite: Reduced desire to eat.
4. Diarrhea: Loose or watery stools.

Less Common Side Effects (0.1-1%)

1. Rash: Red, itchy skin.
2. Headache: Pain or discomfort in the head.
3. Joint pain: Discomfort in joints like knees or elbows.

Serious Side Effects (Rare, <0.1%)

1. Liver problems: Yellowing of the skin or eyes, dark urine, or severe stomach pain.
2. Severe allergic reactions: Difficulty breathing, swelling of the face or throat, or hives.
3. Blood disorders: Unusual bruising or bleeding, or feeling very tired or weak.

Contraindications for Rifapentine

A contraindication is a specific situation where a medication should not be used because it could cause harm. Before starting any new medication, it’s important to know if you have any conditions or are taking other medications that might make the drug unsafe for you.

Rifapentine has several contraindications, including:

1. Severe liver disease: Rifapentine is processed by the liver, so if you have severe liver problems, the medication can build up in your body and cause further damage.
2. Allergy to rifamycins: If you are allergic to rifamycins (a class of antibiotics that includes rifampin and rifabutin), you should not take rifapentine, as it could cause a severe allergic reaction.
3. Porphyria: Rifapentine may worsen this rare genetic condition that affects how your body makes heme, a component of hemoglobin in your blood.

Always discuss your full medical history with your healthcare provider before starting rifapentine, especially if you have any of these conditions. If you are unsure, one of our telemedicine providers can review your history and help determine if rifapentine is safe for you.

Drug Interactions with Rifapentine

Rifapentine can interact with other medications, which may reduce its effectiveness or increase the risk of side effects. It’s important to tell your healthcare provider about all the medications you are taking, including over-the-counter drugs and supplements. Some common drug interactions include:

1. Warfarin (Coumadin): Rifapentine can reduce the effectiveness of warfarin, a blood thinner, which may increase the risk of blood clots.
2. Oral contraceptives (birth control pills): Rifapentine may decrease the effectiveness of birth control pills, increasing the risk of unintended pregnancy.
3. Antiretroviral drugs: Medications used to treat HIV, such as efavirenz (Sustiva) or ritonavir (Norvir), can interact with rifapentine, potentially reducing their effectiveness or increasing side effects.
4. Antifungal medications: Drugs like ketoconazole (Nizoral) or fluconazole (Diflucan) may interact with rifapentine, affecting how both medications work.

It’s crucial to discuss all your medications with your healthcare provider to avoid harmful interactions. If you need help managing your medications, our telemedicine team is available to assist you.

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Rifapentine in Pregnancy

Is it safe to take rifapentine when pregnant?

Rifapentine is classified as a Category C medication during pregnancy, meaning that while no well-controlled studies have been conducted in pregnant women, animal studies suggest there may be potential risks to the fetus. In certain situations, such as treating active tuberculosis, the benefits of using rifapentine may outweigh these risks. However, it’s essential to have a thorough discussion with your healthcare provider about the potential risks and benefits before starting rifapentine if you are pregnant or planning to become pregnant. Our telemedicine providers are available to help you evaluate your options and make an informed decision.

Rifapentine while Breastfeeding

Is it safe to take rifapentine while breastfeeding?

Rifapentine does pass into breast milk, but its effects on a nursing infant are not fully understood. If you are breastfeeding, it’s important to consult your healthcare provider to weigh the potential risks and benefits of taking rifapentine. In some cases, the benefits of treating tuberculosis may outweigh the risks of exposing your infant to the medication. If you have concerns, our telemedicine providers can assist you in making the best decision for both you and your baby.

Estimated Cost of Rifapentine

The cost of a 30-day supply of rifapentine can vary depending on the pharmacy and your location. Without insurance, using a GoodRx coupon, the estimated cost typically ranges from $100 to $150. Prices may fluctuate, so it’s a good idea to check with your local pharmacy or use a discount service like GoodRx to find the most affordable option.

Possible Alternatives to Rifapentine

If rifapentine is not suitable for you, there are alternative treatments and lifestyle changes that may help manage the conditions it treats. Always consult your healthcare provider before making any changes to your treatment plan. Our telemedicine providers are here to help you explore these alternatives.

Alternative Medications for Tuberculosis (TB)

Other medications used to treat TB include rifampin, isoniazid, and ethambutol. In some cases, a combination of these drugs may be prescribed. Additionally, lifestyle changes, such as improving your nutrition and avoiding alcohol, can support your TB treatment.

Latent Tuberculosis Infection

For latent TB, isoniazid or rifampin are commonly used alternatives. Regular monitoring and follow-up with your healthcare provider are crucial to ensure the infection does not progress to active TB.

Alternative Antibiotics for Bacterial Infections

Depending on the type of bacterial infection, antibiotics such as amoxicillin or azithromycin may be considered as alternatives to rifapentine.

Mycobacterial Infections

Treatment for mycobacterial infections may involve other antibiotics like clarithromycin or ethambutol. Your healthcare provider will tailor the treatment based on the specific type of mycobacterial infection you have.

Pulmonary Tuberculosis

In addition to rifapentine, other medications such as pyrazinamide and streptomycin may be used. It’s important to complete the full course of treatment to prevent the development of drug resistance.

Extrapulmonary Tuberculosis

Treatment for extrapulmonary TB is similar to that for pulmonary TB but may require a longer course of therapy, depending on the location of the infection.

Drug-Resistant Tuberculosis

Treating drug-resistant TB often involves a combination of second-line drugs, such as bedaquiline or linezolid. This type of TB requires close monitoring and a specialized treatment plan.

HIV-Associated Tuberculosis

Treatment for HIV-associated TB typically involves a combination of TB medications and antiretroviral therapy. It’s important to work closely with your healthcare provider to effectively manage both conditions.

Chronic Cough

If your chronic cough is caused by TB, treating the underlying infection is essential. If the cough is due to another condition, such as asthma or GERD, other treatments like inhalers or acid reducers may be recommended.

Miliary Tuberculosis

This severe form of TB requires aggressive treatment with multiple antibiotics, often including rifampin, isoniazid, and pyrazinamide.

Recent Updates on Rifapentine Research

Recent studies have focused on shortening the duration of tuberculosis treatment by using rifapentine in combination with other medications. One promising area of research is the use of rifapentine in a shorter, 3-month regimen for latent TB infection, which has been shown to be as effective as the traditional 9-month isoniazid treatment. This shorter course may improve patient adherence and reduce the risk of developing active TB.

Ongoing research is also exploring the use of rifapentine in treating drug-resistant TB and HIV-associated TB, with the goal of improving outcomes in these more complex cases. As research progresses, new treatment protocols may emerge, offering additional options for patients. If you have questions about the latest research or how it might impact your treatment, our telemedicine providers are available to discuss the most up-to-date information with you.

James Kingsley

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