Symptoms: The low systemic absorption of topical terbinafine renders overdosage extremely unlikely.
Accidental ingestion of the contents of one 30 ml bottle containing 300 mg terbinafine hydrochloride, is comparable to ingestion of one tablet containing 250 mg of terbinafine hydrochloride (adult oral unit dose).
Should a larger amount of terbinafine be inadvertently ingested, adverse effects similar to those observed with an overdosage of terbinafine tablets are to be expected. These include headache, nausea, epigastric pain and dizziness.
In case of accidental oral ingestion, the ethanol content has to be considered. The drug contains 30.56% w/w ethanol.
Treatment of overdose: If an overdose occurs, terbinafine hydrochloride should be eliminated by the administration of activated charcoal, and giving symptomatic supportive therapy if needed. Accidentally ingested, the recommended treatment of overdosage consists of eliminating the active substance, primarily by the administration of activated charcoal, and giving symptomatic supportive therapy if needed.