Isoprinosine (Inosine Pranobex)

Isoprinosine is an immunomodulatory antiviral indicated for several viral and immune‑related conditions.

• Herpes simplex virus infections: reduces lesion duration and severity.
• Human papillomavirus infections: assists in clearance of lesions.
• Influenza and other acute viral infections: shortens illness course.
• Immunodeficiency states: enhances overall immune response.
• Prophylaxis of viral infections in immunocompromised patients: helps prevent infection onset.

• Isoprinosine (inosine pranobex) acts by stimulating cellular immunity. It promotes proliferation of T‑lymphocytes, increases natural killer cell activity, and induces endogenous interferon production. These immunologic effects enhance the host’s ability to control viral replication and improve clearance of infected cells, providing broad antiviral activity without direct viral targeting. Additionally, the compound modulates cytokine release, contributing to its immunostimulatory profile.

Isoprinosine may cause a range of adverse reactions, which are categorized by frequency and severity.

Common Side Effects

• Nausea: mild to moderate stomach upset.
• Headache: transient cranial discomfort.
• Fever: low‑grade temperature elevation.
• Abdominal discomfort: mild pain or cramping.
• Dizziness: occasional light‑headedness.

Serious or Rare Side Effects

• Severe allergic reactions: including anaphylaxis and angioedema.
• Hepatic enzyme elevation: possible liver function abnormalities.
• Blood dyscrasias: such as neutropenia or thrombocytopenia.
• Severe skin reactions: including Stevens‑Johnson syndrome or toxic epidermal necrolysis.

When prescribing Isoprinosine, several precautionary measures should be observed to ensure patient safety.

• Monitor liver function: perform baseline and periodic liver enzyme tests.
• Assess immune status: evaluate before initiating therapy in immunocompromised patients.
• Use with caution in renal impairment: adjust dosing if renal function is reduced.
• Avoid in known hypersensitivity: discontinue immediately if allergic reaction occurs.
• Store at room temperature: keep in the original pack, protect from moisture and light.

Isoprinosine can interact with other medicines; awareness of significant interactions helps prevent adverse outcomes.

Major Interactions (Avoid)

• Concomitant immunosuppressants: may diminish antiviral efficacy.
• Live vaccines: increased risk of vaccine‑derived infection.

Moderate Interactions (Monitor Closely)

• Anticoagulants (e.g., warfarin): may alter INR values.
• Anticonvulsants (e.g., phenytoin): possible metabolic interference.
• Corticosteroids: additive immunomodulatory effects may require monitoring.