Ritonavir is an antiretroviral substance that inhibits an enzyme, known as protease, preventing the replication of the HIV virus. Thus, although this medicine does not cure HIV, it is used to delay the development of the virus in the body, preventing the onset of AIDS.
This substance can be found under the trade name Norvir and is usually provided free by SUS for people with HIV.
How to take
Ritonavir is usually used together with other HIV medicines, as it enhances its effects. Therefore, in adults the doses may vary according to the combination of remedies:
- Ritonavir 100 mg + Amprenavir 600 mg: 2 times a day; Ritonavir 100 mg + Atazanavir 300 mg: once daily; Ritonavir 100 mg + Fosamprenavir 700 mg: twice daily; Ritonavir 100 mg + Saquinavir 1000 mg: 2 times a day.
The tablets should be taken whole and preferably during or after a meal.
Doses may vary according to each person, so it is very important to follow all the doctor's instructions.
Possible side effects
Some of the side effects that may arise with prolonged use of ritonavir include changes in blood tests, hives, headache, dizziness, insomnia, anxiety, confusion, blurred vision, changes in blood pressure, abdominal pain, nausea, diarrhea, excess gas, acne and joint pain.
In addition, ritonavir also reduces the absorption of some oral contraceptives and, therefore, if you are being treated with this medicine it is very important to use another contraceptive method to prevent a possible unwanted pregnancy.
Who should not take
Ritonavir is contraindicated for people who are hypersensitive to any of the components of the formula. In addition, ritonavir can also interact with the effect of several types of medication and, therefore, its use should always be guided and evaluated by a doctor.
