Ondasetron Hikma (Ondansetron)

Ondansetron acts on the serotonergic pathway to control nausea and vomiting. It is indicated for:

• Chemotherapy-induced nausea and vomiting (CINV): helps reduce the frequency and severity of nausea and vomiting caused by cytotoxic drugs.
• Radiation-induced nausea and vomiting (RINV): provides relief from nausea and vomiting that occur during or after radiotherapy.
• Post‑operative nausea and vomiting (PONV): reduces the incidence of nausea and vomiting following surgical procedures.

• Ondansetron selectively blocks the 5‑hydroxytryptamine type 3 (5‑HT3) receptors located in the chemoreceptor trigger zone, vagal afferents, and the gastrointestinal tract. By inhibiting these receptors, it prevents serotonin‑mediated activation of the vomiting centre in the brainstem, thereby reducing nausea and vomiting signals.

Common Side Effects

• Headache: mild to moderate headache reported.
• Constipation: reduced bowel movements.
• Diarrhoea: loose stools.
• Fatigue: feeling of tiredness.
• Dizziness: light‑headed sensation.
• Injection site reactions (if applicable): mild pain or erythema.

Serious or Rare Side Effects

• Cardiac arrhythmia: QT‑interval prolongation leading to irregular heart rhythm.
• Severe allergic reaction: anaphylaxis, angioedema, or urticaria.
• Serotonin syndrome: rare but potentially life‑threatening when combined with other serotonergic agents.
• Hepatic dysfunction: elevated liver enzymes.
• Severe constipation or intestinal obstruction.
• Neuroleptic malignant‑like syndrome: extremely rare neurological emergency.

Before using Ondasetron Hikma, consider the following precautions:

• Cardiac monitoring: patients with known QT prolongation or electrolyte imbalance should be monitored.
• Electrolyte assessment: correct potassium or magnesium deficiencies prior to therapy.
• Drug interactions: review concomitant medications that may affect cardiac rhythm.
• Pregnancy: use only if the potential benefit justifies the risk to the fetus.
• Breastfeeding: assess risk versus benefit as the drug may pass into milk.
• Store at below 25°C: keep in the original packaging, protect from moisture and direct sunlight.

Ondansetron may interact with several medications. Review the following:

Major Interactions (Avoid)

• Apatinib: may increase the risk of QT prolongation.
• Certain pharmac​ ‑   ---

Moderate Interactions (Monitor Closely)

• Ond  ---

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