Side Effects and Toxicity Alcoholic extracts of gotu kola have shown no toxicity at doses of 350 mg/kg when given i.p. to rats.1 Reported adverse effects include GI upset and nausea. Topical use of the extract has led to reports of rash.25 Three cases of jaundice with elevated liver enzymes were reported in Argentina following dosing of Centella. Patients had taken Centella (standardization and dose unknown) for 20-60 days, and recovered on discontinuation of the herb.26