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- What is didanosine, and how does it work (mechanism of action)?
- What are the uses for didanosine?
- What are the side effects of didanosine?
- What is the dosage for didanosine?
- Which drugs or supplements interact with didanosine?
- Is didanosine safe to take if I'm pregnant or breastfeeding?
- What else should I know about didanosine?
What is didanosine, and how does it work (mechanism of action)?
Didanosine is an oral medication that is used for the treatment of infections with the human immunodeficiency virus (HIV). It is in a class of drugs called reverse transcriptase inhibitors which also includes zalcitabine (Hivid), zidovudine (Retrovir), stavudine (Zerit), and lamivudine (Epivir). During infection with HIV, the HIV virus multiplies within the body's cells. The newly-formed viruses then are released from the cells and spread throughout the body where they infect other cells. In this manner, the infection spreads to new, uninfected cells that the body is continually producing, and HIV infection is perpetuated. When producing new viruses, the HIV virus must manufacture new DNA for each virus. Reverse transcriptase is the enzyme that the virus uses to form this new DNA. Specifically, didanosine is converted within the body to its active form (dideoxyadenosine triphosphate). This active form is similar to a chemical, deoxyadenosine triphosphate, that is required by the HIV virus to make new DNA. The reverse transcriptase uses dideoxyadenosine triphosphate instead of deoxyadenosine triphosphate for making DNA, and the dideoxyadenosine triphosphate that interferes with the reverse transcriptase. Didanosine does not kill existing HIV virus and it is not a cure for HIV. The FDA approved didanosine in October 1991.
What brand names are available for didanosine?
Videx, Videx EC
Is didanosine available as a generic drug?
GENERIC AVAILABLE: Yes
Do I need a prescription for didanosine?
What are the side effects of didanosine?
The most severe side effects of didanosine are:
- inflammation of the pancreas (pancreatitis),
- liver failure, and
- nerve damage in the arms and legs (peripheral neuropathy).
Other important side effects include:
What is the dosage for didanosine?
Adults weighing 60 kg or more should receive 400 mg once daily of the capsules or 200 mg twice daily of the powder. Adults weighing less than 60 kg require 250 mg once daily of the capsules and 125 mg twice daily of the powder.
Didanosine should be administered on an empty stomach because food reduces the absorption of didanosine by as much as 46%.
Which drugs or supplements interact with didanosine?
Didanosine powder contains an antacid which reduces the absorption of tetracycline (for example, Vibramycin, Minocin), ketoconazole (Nizoral), fluoroquinolone antibiotics (for example, ciprofloxacin [Cipro], Floxin), and other drugs that need stomach acid for absorption. Therefore, these drugs should be administered at least two hours before or after administration of didanosine solution.
Is didanosine safe to take if I'm pregnant or breastfeeding?
Although it is not known whether didanosine is excreted in breast milk, HIV-infected mothers should not breast feed because of the potential risk of transmitting HIV to an infant that is not infected.
What else should I know about didanosine?
What preparations of didanosine are available?
Capsules (Extended Release): 125, 200, 250, and 400 mg. Solution: 10 mg/ml
How should I keep didanosine stored?
Capsules and unmixed powder should be stored at room temperature, 15 C to 30 C (59 F to 86 F). The powder may be stored in the refrigerator at 2 C to 8 C (36 F to 46 F for up to 30 days after it is mixed with water.
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Didanosine (Videx, Videx EC) is a drug prescribed for the treatment of the human immunodeficiency virus (HIV) in adults and children. Review side effects, dosage, drug interactions, pregnancy safety, and warnings and precautions information prior to taking this medication.
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Human Immunodeficiency Virus (HIV)
HIV (human immunodeficiency virus) infection left untreated causes AIDS (acquired immunodeficiency syndrome). Still incurable, AIDS describes immune system collapse that opens the way for opportunistic infections and cancers to kill the patient. Early symptoms and signs of HIV infection include flu-like symptoms and fungal infections, but some people may not show any symptoms for years. Highly active antiretroviral therapy (ART) is the standard treatment for HIV infection. These combination drug regimens have made HIV much less deadly, but a cure or vaccine for the pandemic remains out of reach. HIV is usually transmitted through sexual contact or sharing IV drug needles, but can also infect someone through contact with infected blood. Sexual abstinence, safe sex practices, quitting IV drugs (or at least using clean needles), and proper safety equipment by clinicians and first responders can drastically reduce transmission rates for HIV/AIDS.
AIDS (Acquired Immunodeficiency Syndrome)
AIDS is the advanced stage of HIV infection. Symptoms and signs of AIDS include pneumonia due to Pneumocystis jiroveci, tuberculosis, toxoplasmosis, seizures, weakness, meningitis, yeast infection of the esophagus, and Kaposi's sarcoma. Anti-retroviral therapy (HAART) is used in the treatment of AIDS.
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