Nevirapina Normon (Nevirapine)

Nevirapine is an antiretroviral drug that targets HIV‑1 reverse transcriptase and is employed in combination therapy for HIV infection.

• Adult HIV‑1 infection: reduces viral load and improves immune function when used with other antiretrovirals.
• Adolescent HIV‑1 infection: part of combination regimens to control viral replication in patients aged 12‑17.
• Pediatric HIV‑1 infection (≥2 years): used with other agents to suppress HIV‑1 in children.

• Nevirapine binds to a non‑nucleoside site on the HIV‑1 reverse transcriptase enzyme, inducing a conformational change that blocks the enzyme’s RNA‑ and DNA‑dependent DNA polymerase activity. This inhibition prevents the conversion of viral RNA into DNA, halting viral replication and reducing plasma HIV levels.

Nevirapine may cause a range of adverse reactions, from mild to severe.

Common Side Effects

• Rash: mild to moderate skin eruptions.
• Nausea: occasional gastrointestinal upset.
• Headache: transient cranial discomfort.
• Fatigue: feeling of tiredness.
• Abdominal pain: mild stomach discomfort.
• Dizziness: occasional light‑headedness.

Serious or Rare Side Effects

• Stevens‑Johnson syndrome: severe skin reaction requiring immediate medical attention.
• Hepatic failure: signs of liver injury such as jaundice.
• Severe hypersensitivity: systemic allergic response.
• Hepatotoxicity: elevated liver enzymes or liver inflammation.
• Life‑threatening skin reactions: toxic epidermal necrolysis.
• Severe anemia: marked reduction in red blood cells.

Before initiating therapy, clinicians should assess patient history and monitor for specific risks.

• Liver function monitoring: check baseline enzymes and repeat periodically.
• Hypersensitivity assessment: avoid in patients with known nevirapine allergy.
• CD4 count evaluation: higher risk of rash in women with CD4 >250 cells/µL.
• Counseling on rash: advise patients to report any skin changes promptly.
• Pregnancy considerations: use only if benefits outweigh potential risks.
• Store at ambient temperature: keep in original container, protect from moisture and direct sunlight.

Nevirapine interacts with several medicines that can alter its effectiveness or increase toxicity.

Major Interactions (Avoid)

• Ritonavir‑boosted protease inhibitors: can significantly increase nevirapine levels.
• St. John’s wort: induces metabolism, reducing nevirapine exposure.
• Carbamazepine: strong enzyme inducer that lowers nevirapine concentrations.

Moderate Interactions (Monitor Closely)

• Warfarin: may require INR monitoring due to altered anticoagulant effect.
• Oral contraceptives: efficacy may be reduced, consider alternative contraception.
• Nephrotoxic drugs: monitor renal function when used together.