Ramosetron hydrochloride
Indications
Ramosetron hydrochloride is used for:
Irritable Bowel Syndrome with Diarrhea (IBS-D)
Adult Dose
Oral
Tablet
Irritable Bowel Syndrome with Diarrhea in Men
Adult: 5 mcg once daily, may adjust dose according to symptoms.
Max: 10 mcg/day.
Irritable Bowel Syndrome with Diarrhea in Women
Adult: 2.5 mcg once daily, may adjust dose according to symptoms.
Max: 5 mcg/day.
Child Dose
Renal Dose
Caution in renal impairment
Administration
May be taken with or without food.
Contra Indications
Hypersensitivity to Ramosetron or any of its components
History of severe or chronic constipation
Safety not established in children under 18 years (oral use)
Precautions
Use with caution in patients with a history of constipation
Should be used with caution in patients with liver and kidney diseases
Monitor ECG if the patient is on other QT-prolonging agents
Monitor liver and kidney function tests in patients with liver and kidney diseases
Pregnancy-Lactation
Safety in pregnancy and lactation is not well-established. Not recommended in lactation.
Interactions
CYP450 enzyme inducers/inhibitors may affect metabolism
QT-prolonging agents (e.g., amiodarone, haloperidol): additive risk of arrhythmias
May increase the plasma concentration when given with fluvoxamine
Adverse Effects
Side effects of Ramosetron hydrochloride :
Very Common (>10%):
Headache
Constipation
Common (1–10%):
Nausea
Dizziness
Fatigue
Rash
Itching
Redness
Hot flushes
Hiccup
Numbness of the tongue
Rare (<1%):
Hypersensitivity reactions (including anaphylaxis)
Elevated liver enzymes
QT interval prolongation (very rare)
Mechanism of Action
Ramosetron Hydrochloride (oral) is a selective serotonin 5-HT₃ receptor antagonist that works by inhibiting the action of serotonin on 5-HT₃ receptors located in the gastrointestinal tract and the central nervous system.
In conditions like irritable bowel syndrome with diarrhea (IBS-D), it reduces abnormal gastrointestinal motility, secretion, and visceral pain by blocking 5-HT₃ receptors in the enteric nervous system.
This action helps normalize bowel movements and reduce urgency. Ramosetron also prevents nausea and vomiting by blocking serotonin-induced stimulation of vagal afferents in the gut and the chemoreceptor trigger zone (CTZ).