๐ Indications & Clinical Dosage
*Moderately emetogenic chemotherapy or radiotherapy:*
ORAL: Adult: 8 mg, 1-2 hours before treatment, then 8 mg every 12 hrs for up to 5 days.
BY RECTUM: Adult: 16 mg, 1-2 hours before treatment, then 16 mg daily for up to 5 days.
BY IM INJ, OR BY SLOWIV INJ: Adult: 8 mg, immediately before treatment, then (oral) 8 mg every 12 hours for up to 5 days, alternatively (by rectum) 16 mg daily for up to 5 days.
BY IM INJ, OR BY IV INF: Elderly: 8 mg, immediately before treatment, IV INF to be given over at least 15 minutes, then (oral) 8 mg every 12 hours for up to 5 days, alternatively (by rectum) 16 mg daily for up to 5 days
*Severely emetogenic chemotherapy:*
ORAL: Adult: 24 mg, dose to be taken 1-2 hours before treatment, then 8 mg every 12 hours for up to 5 days
BY RECTUM: Adult: 16 mg, dose to be administered 1-2 hours before treatment, then 16 mg daily for up to 5 days
BY IM INJ, OR BY SLOWIV INJ: Adult: 8 mg, dose to be administered immediately before treatment, followed by (by IM inj or by slow IV inj) 8 mg every 4 hours if required for 2 doses, alternatively, followed by (by continuous IV INF) 1 mg/hour for up to 24 hours, then (oral) 8 mg every 12 hours for up to 5 days, alternatively (by rectum) 16 mg daily for up to 5 days.
Children 6 months-18 yrs: By IV INF over at least 15 minutes, 150 mcg/kg immediately before chemotherapy (max single dose 8 mg) repeated every 4 hr for 2 further doses, then give by mouth; max total daily dose 32mg. Oral dosing can start 12 hr after IV administration; for bodyweight 10 kg or less, 2 mg every 12 hr for up to 5 days (max total daily dose 32 mg); body-weight over 10 kg, 4 mg every 12 hr for up to 5 days (max total daily dose 32 mg); bodyweight over 40 kg, 8 mg every 12 hr for up to 5 days (max total daily dose 32 mg).
*Prevention and treatment of postoperative nausea and vomiting:*
ORAL: Adult: 16 mg, dose to be taken 1 hour before anaesthesia,
BY IM INJ OR BY SLOW IV INJ: Adult: 4 mg, dose to be administered at induction of anaesthesia
Children 1 months-18 yrs: 100 mcg/kg (max 4 mg) as a single dose by slow IV injection over at least 30 sec, before, during, or after induction of anaesthesia.
๐ Mode of Administration
IM: Should be given undiluted. IV: Give first dose 30 min prior to beginning chemotherapy; the IV preparation has been successful when administered orally. IVPB: Infuse over 15-30 min; 24-hour continuous infusions have been reported, but are rarely used.
RECONSTITUTION: Prior to IV infusion, dilute in 50-100 ml D5W or NS.
โ ๏ธ Precautions & Warnings
Hepatic impairment, adenotonsillar surgery, sub acute intestinal obstruction, susceptibility to QT-interval prolongation(including electrolyte disturbances).
๐ Drug Interactions
Tramadol, Phenytoin, rifampicin, carbamazepine,
โ ๏ธ Adverse Reactions / Side Effects
Constipation, headache, flushing, arrhythmias, bradycardia, chest pain, hiccups, hypotension, movement disorders, seizure, transient rise in liver enzymes, ST segment depression, extra-pyramidal reactions, visual disturbance.
๐คฐ Pregnancy & Lactation Safety
Pregnancy Risk:
Caution advised
Lactation / Breastfeeding:
Caution advised
๐งช Compatibility & Storage Stability
Compatibility: Stable in D5 1/2 NS, D5NS, DSW, mannitol10%, LR, NS, NS 3%. do not mix injection with alkaline solutions.
Y-site administration: See drug to drug compatibility and incompatibility chart.
Stability & Storage: Store vials between 2C-30C. Protect from light. Stable when mixed in 5% dextrose or 0.9% NaCI for 48 hours at room temperature.