What is Isentress?
Isentress is a prescription HIV treatment used together with other antiretroviral drugs to manage human immunodeficiency virus type 1 infection.
It contains raltegravir, which helps lower the amount of virus in the blood and supports the immune system.
By reducing viral load and increasing CD4 cells, Isentress treatment helps the body fight infections and lowers the risk of complications linked to HIV.
It is approved for adults and for children 2 years of age and older who meet weight requirements. This product does not cure HIV, but it plays an important role in long-term HIV care and control.
Indications and Benefits of Isentress
Isentress is used to treat HIV 1 infection in combination with other antiretroviral therapy.
It can be prescribed to patients who are new to HIV treatment, which means they have not taken HIV drugs before, as well as to those who have already received other treatments in the past and may need a different option.
This type of use is often called treatment naive for new patients and treatment experienced for those who have used HIV drugs before.
What Are the Benefits of Isentress?
- Helps reduce the amount of HIV in the blood, which supports better long-term disease control.
- Improves immune function by increasing CD4 cells that help the body fight infections.
- Plays an important role in many modern Isentress treatment plans due to its strong antiviral activity.
- Lowers the risk of serious infections that can occur when the immune system is weak.
- Offers a treatment option for both adults and children, which adds flexibility in care.
- Shows manageable Isentress medication side effects in many patients when used as directed.
- Supports consistent dosing, which helps prevent problems related to an Isentress missed dose.
- Can be combined with other HIV drugs with proper review of Isentress drug interactions.
- Has been evaluated in different patient groups, including cases assessing whether Isentress is safe in pregnancy.
- Helps achieve viral suppression, which may improve overall quality of life.
- Includes known and monitorable Isentress common side effects that healthcare providers can manage.
Isentress Fact Table
| Fact Category | Fact Details |
| Generic Name | Raltegravir |
| Isentress Class | Integrase strand transfer inhibitor |
| Primary Use | Treatment of HIV 1 infection in combination with other antiretroviral therapy |
| Additional Benefit | Helps lower viral load and improve CD4 cell count to support immune function |
| Available Form | Film-coated tablets, chewable tablets, and granules for oral suspension |
| Method of Administration | Taken by mouth with or without food |
| Frequency | Usually taken twice daily as prescribed by a healthcare provider |
| Storage Instructions | Store at room temperature in original packaging away from moisture and light |
| Pregnancy and Breastfeeding | Use in pregnancy may be considered if benefits outweigh risks, and is not recommended during breastfeeding due to the risk of HIV transmission |
| Drug Interactions | May interact with rifampin, antacids, and other drugs that affect metabolism, so a full medication review is required |
| Manufacturer | Merck and Co Inc |
How It Works
Isentress works by blocking an enzyme called integrase, which HIV needs to multiply inside the body.
An enzyme is a protein that helps chemical processes happen. The integrase enzyme allows the virus to insert its genetic material into healthy immune cells. Once inside, the virus can make more copies of itself.
By stopping this step, Isentress prevents the virus from spreading to new cells. This helps lower the amount of HIV in the blood, also known as viral load, and allows the immune system to recover.
Over time, this leads to an increase in CD4 cells, which are white blood cells that help protect the body from infections.
How effective is Isentress?
Isentress is effective for many people living with HIV, including those who are starting treatment for the first time and those who have used other HIV drugs before.
In clinical studies, many patients reached very low or undetectable viral levels within weeks to months of starting therapy, and a large number stayed well controlled for years when Isentress was taken regularly with other HIV drugs. Long-term research also showed that Isentress can keep the virus suppressed over time, which helps protect the immune system and lower the risk of HIV related illness.
Most treatment failure was seen early and were often linked to missed doses or resistance, which means the virus no longer responds as well to treatment.
Dosage
The right Isentress dosage depends on the patient’s age, body weight, treatment history, and the form being used.
Isentress must be taken with other antiretroviral drugs as part of a complete HIV treatment plan.
For adults, the usual Isentress dosage is 400 mg taken by mouth twice daily.
In children, dosing is based on weight and may use film-coated tablets or chewable tablets, depending on age and body weight.
Film-coated tablets must be swallowed whole, while chewable tablets may be chewed or swallowed whole.
These forms are not directly interchangeable, so patients should only use the exact form and strength prescribed by their healthcare provider. In special cases, such as use with rifampin, the dose may need adjustment.
Isentress dosage for PEP and any Isentress off-label use should only be determined by your doctor, since these uses require careful medical guidance.
What Dosage Strengths Does Isentress Come In?
- 400 mg film-coated tablets
- 100 mg chewable tablets
- 25 mg chewable tablets
Isentress Recommended Dosage Chart
| Population or Condition | Body Weight | Recommended Dosage | Form |
| Adults with HIV 1 infection | Not weight-based | 400 mg twice daily | Film-coated tablet |
| Adults taking rifampin | Not weight-based | 800 mg twice daily | Film-coated tablet |
| Children 12 years of age and older | Not weight-based | 400 mg twice daily | Film-coated tablet |
| Children 6 to less than 12 years of age | At least 25 kg | 400 mg twice daily | Film-coated tablet |
| Children 2 to less than 12 years of age | 10 kg to less than 14 kg | 75 mg twice daily | Chewable tablets |
| Children 2 to less than 12 years of age | 14 kg to less than 20 kg | 100 mg twice daily | Chewable tablets |
| Children 2 to less than 12 years of age | 20 kg to less than 28 kg | 150 mg twice daily | Chewable tablets |
| Children 2 to less than 12 years of age | 28 kg to less than 40 kg | 200 mg twice daily | Chewable tablets |
| Children 2 to less than 12 years of age | At least 40 kg | 300 mg twice daily | Chewable tablets |
Usage Guide
Isentress is used as part of a combination therapy, which means it must be taken with other HIV drugs for the best results.
Taking Isentress on a regular schedule helps maintain steady levels in the body, which supports viral suppression and reduces the risk of resistance.
Patients should continue treatment even if they feel well, since HIV requires ongoing management.
Proper use also helps avoid issues such as Isentress missed dose and supports long-term treatment success.
How do you take Isentress?
- Take Isentress exactly as directed and follow the recommended schedule carefully.
- Take the dose by mouth with or without food based on your routine.
- Swallow film-coated tablets whole and do not crush or split them.
- Chew chewable tablets or swallow them whole as instructed.
- Take doses at the same times each day to keep consistent drug levels in your body.
- Do not skip doses since missing doses may reduce effectiveness and lead to resistance.
- If a dose is missed, take it as soon as you remember, unless it is close to your next dose, then continue your regular schedule.
- Do not take two doses at the same time to make up for a missed dose.
- Do not switch between different forms or stop treatment without medical guidance.
- Avoid antacids that contain aluminum or magnesium unless advised otherwise.
- Stay consistent with follow-up visits to monitor your progress and safety.
- Refill your prescription before you run out to avoid interruptions in treatment.
Side Effects
Isentress is generally well-tolerated, but some people may experience side effects while taking it. Most reactions are mild and improve as the body adjusts, while others may be serious and need immediate attention.
Common side effects
- Headache
- Dizziness
- Nausea
- Tiredness
- Trouble sleeping
- Weakness
- Stomach discomfort
- Vomiting
Serious side effects
- Severe skin reactions such as rash, blisters, peeling skin, or mouth sores
- Allergic reactions with swelling of the face, lips, or mouth, and trouble breathing
- Liver problems, including yellowing of the skin or eyes, dark urine, pale stools, and loss of appetite
- Muscle problems such as unexplained pain, tenderness, or weakness, which may lead to serious muscle damage
- Immune reconstitution syndrome, where hidden infections become active as the immune system improves
- Mental health changes, including depression or suicidal thoughts
- Kidney problems, including kidney failure or kidney stones
Missed Dose
If you miss a dose of Isentress, take it as soon as you remember. If it is already close to your next scheduled dose, skip the missed dose and continue with your regular schedule.
Do not take two doses at the same time or take extra doses to make up for a missed one.
Taking Isentress consistently is important to keep the virus under control and reduce the risk of resistance.
Overdose
If too much Isentress is taken, seek medical help right away or go to the nearest emergency room.
There is no specific antidote, so treatment will focus on monitoring symptoms and providing supportive care.
Follow the prescribed dose carefully to avoid potential risks and unwanted side effects.
Storage Information
Store Isentress at room temperature between 20 and 25 degrees Celsius in its original packaging to protect it from moisture and light.
Keep the bottle tightly closed and leave the drying agent inside to help prevent moisture damage. Keep it in a safe place out of reach of children.
Warnings
Isentress should be used with care as part of a complete HIV treatment plan. While it is generally well tolerated, certain Isentress medication side effects can be serious and require close monitoring.
Patients should be aware of possible reactions and follow medical advice closely to reduce risks.
Early recognition of symptoms and proper use can help improve safety and treatment success.
- Severe skin reactions may occur, including rash with fever blisters or peeling skin, and require immediate medical attention.
- Allergic reactions may involve swelling of the face, lips, or mouth along with difficulty breathing and should be treated as an emergency.
- Liver problems may develop, and signs such as yellowing of the skin, dark urine, or stomach pain should be reported right away.
- Immune reconstitution syndrome may happen when the immune system becomes stronger and starts fighting hidden infections, which can cause new symptoms.
- Muscle-related problems, including pain, tenderness, or weakness, may occur and, in rare cases, can lead to serious muscle damage.
- Use with caution in patients with liver disease, kidney issues, or a history of muscle disorders.
- Chewable tablets contain phenylalanine, which may be harmful for patients with phenylketonuria.
- Avoid certain antacids and review Isentress drug interactions since some products may reduce how well the treatment works.
- Do not stop treatment suddenly since this may worsen HIV control and increase the risk.
- Pregnancy use should be carefully evaluated to determine if the benefits outweigh the risks and discuss if Isentress is safe in pregnancy.
- Breastfeeding is not recommended due to the risk of passing HIV to the baby.
Boxed Warning and Precautions for Isentress
| Isentress does not carry a formal boxed warning, but it is associated with important safety precautions that should be taken seriously. Rare but life-threatening reactions, such as severe skin conditions and hypersensitivity reactions, have been reported, and these may affect multiple organs, including the liver. Prompt recognition and stopping treatment when severe symptoms appear are critical to prevent complications. Careful monitoring, awareness of Isentress common side effects, and proper management of Isentress drug interactions are essential to ensure safe and effective use. |
Contraindications
There are no known absolute contraindications for Isentress, which means there are no specific conditions where it must not be used.
However, it should still be used with caution in certain individuals based on their medical history and current treatment plan.
Patients should inform their doctor about any existing health conditions and all other drugs they are taking to avoid possible Isentress drug interactions and reduce the risk of side effects.
Careful evaluation helps ensure that Isentress treatment is safe and appropriate for each individual.
Is Isentress safe in pregnancy?
Isentress may be used during pregnancy if the benefits outweigh the potential risks.
Available data have not shown an increased risk of major congenital disabilities, which provides some reassurance for pregnant patients.
There is also a pregnancy registry that tracks outcomes in those who take Isentress during pregnancy to monitor safety. A medical professional should always guide treatment decisions to ensure both the mother and baby are protected.
Interactions
Isentress may interact with certain drugs that can increase or decrease its levels in the body.
These Isentress drug interactions can affect how well the treatment works, so it is important to review all medications and supplements before use.
- Rifampin
- Atazanavir
- Atazanavir with ritonavir
- Efavirenz
- Etravirine
- Tipranavir with ritonavir
- Omeprazole
- Aluminum-containing antacids
- Magnesium-containing antacids
- Calcium carbonate antacids
- Phenytoin
- Phenobarbital
- Carbamazepine
- Boceprevir
- Hormonal contraceptives
- Methadone
- Lamivudine
- Tenofovir
- Darunavir with ritonavir
- Midazolam
Cost & Coupons
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Frequently Asked Questions
Buying Isentress from Canada
FDA-Prescription, Off-Label Information, and Limitations
Dosage & Administration
Adverse Reactions
Food & Drug Interactions
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Drug Comparison
Disclaimer
Pharma Giant provides medical information to help you better understand medications and medical conditions.This content is for informational use only and does not replace advice from a licensed medical practitioner. Consult your doctor or pharmacist before starting or changing any medication. All our partners follow strict safety standards set by their country’s health authorities to make sure you receive safe and high-quality medications.
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