Lamivudine/zidovudine is a pharmaceutical treatment for HIV infection. It is a fixed dose combination

Fixed dose combination (antiretroviral)

Fixed-dose combinations of antiretrovirals are multiple antiretroviral drugs combined into a single pill, which helps reduce pill burden. They may combine different classes of antiretrovirals or contain only a single class. Licensed fixed-dose combinations are shown in the table below....

 of two antiretroviral drug

Antiretroviral drug

Antiretroviral drugs are medications for the treatment of infection by retroviruses, primarily HIV. When several such drugs, typically three or four, are taken in combination, the approach is known as Highly Active Antiretroviral Therapy, or HAART...

s, lamivudine

Lamivudine

Lamivudine is a potent nucleoside analog reverse transcriptase inhibitor .It is marketed by GlaxoSmithKline with the brand names Zeffix, Heptovir, Epivir, and Epivir-HBV.Lamivudine has been used for treatment of chronic hepatitis B at a lower dose than for treatment of HIV...

 (also called 3TC, with the brand name Epivir) and zidovudine

Zidovudine

Zidovudine or azidothymidine is a nucleoside analog reverse-transcriptase inhibitor , a type of antiretroviral drug used for the treatment of HIV/AIDS. It is an analog of thymidine....

 (also called AZT, with the brand name Retrovir). The combination of the two drugs has a stronger and more sustained effect than using either drug alone, and assists in reducing pill burden

Polypharmacy

Polypharmacy is the use of multiple medications by a patient, especially when too many forms of medication are used by a patient, when more drugs are prescribed than is clinically warranted, or even when all prescribed medications are clinically indicated but there are too many pills to take ....

 and in aiding compliance with the antiretroviral drug therapy.

Both lamivudine and zidovudine are reverse transcriptase inhibitor

Reverse transcriptase inhibitor

Reverse-transcriptase inhibitors are a class of antiretroviral drug used to treat HIV infection, tumors, and cancer. RTIs inhibit activity of reverse transcriptase, a viral DNA polymerase enzyme that retroviruses need to reproduce.-Mechanism:...

s, which block the action of an enzyme

Enzyme

Enzymes are proteins that catalyze chemical reactions. In enzymatic reactions, the molecules at the beginning of the process, called substrates, are converted into different molecules, called products. Almost all chemical reactions in a biological cell need enzymes in order to occur at rates...

, reverse transcriptase

Reverse transcriptase

In the fields of molecular biology and biochemistry, a reverse transcriptase, also known as RNA-dependent DNA polymerase, is a DNA polymerase enzyme that transcribes single-stranded RNA into single-stranded DNA. It also helps in the formation of a double helix DNA once the RNA has been reverse...

, that the virus requires for reproduction. It reduces the viral load

Viral load

Viral load is a measure of the severity of a viral infection, and can be calculated by estimating the amount of virus in an involved body fluid. For example, it can be given in RNA copies per milliliter of blood plasma...

 in the body and raises CD4 cell count.

It was approved for use in the United States by the Food and Drug Administration on September 26, 1997, making it the thirteenth approved antiretroviral. It is marketed by ViiV Healthcare

ViiV Healthcare

ViiV Healthcare is a pharmaceutical company specializing in the development of therapies for HIV that was created as a joint venture by Pfizer and GlaxoSmithKline in November 2009 with both companies transferring their HIV assets to the new company. 85% of the company is owned by GlaxoSmithKline...

.

Combivir users typically report feeling tired and sick.

External links

• Combivir website operated by GlaxoSmithKline