Drug reference

simethicone

Antifoaming agent; Surfactant · Antiflatulent

Antifoaming agent; SurfactantAntiflatulentATC A03AX13

CDSCO approvedATC A03AX13

EXCRETION

—

not curated

INTERACTIONS

—

none in our sources

PREGNANCY

—

not curated

Mechanism

Simethicone is an inert, nontoxic surfactant. It collapses gas bubbles by forming a thin layer on their surface, acting as an effective antifoaming agent.

Indications

FlatulenceBloatingFullness

Dosing

Adult: 40 to 125 mg four times daily after meals.
Pediatric: 20 to 50 mg four times daily after meals and at bedtime, depending on age.

Drug interactions

Levothyroxine

Moderate

Database

Decreased levothyroxine efficacy, potentially leading to increased TSH levels.

May require increased levothyroxine dosage.

Source: DDInter

2 additional low-confidence interactions hidden — those rows lack a documented mechanism or management plan in our sources.

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Sources: Goodman & Gilman 14e·Verified: 2026-05-10 · House clinical team