Topiramato Dosing and Administration

Introduction to Topiramato

The American Gastroenterological Association recommends a maximum daily dose of topiramato of 92 mg when used in combination with phentermine for weight loss in adults 1, 2
The combination of phentermine and topiramato is available in four doses: 3.75/23 mg, 7.5/46 mg, 11.25/69 mg, and 15/92 mg of phentermine/topiramato, with a recommended starting dose of 3.75/23 mg for 14 days, followed by a maintenance dose of 7.5/46 mg daily 1, 3

The American Gastroenterological Association suggests that if a patient has not lost at least 3% of their body weight after 12 weeks, consideration should be given to discontinuing or increasing the dose of phentermine/topiramato 3
Adults with renal impairment may require dose adjustments, and those undergoing hemodialysis may need supplemental doses to maintain anticonvulsant effects, although specific guidance is not provided in the cited references 4

Common side effects of topiramato include parestesias, dizziness, dysgeusia, insomnia, constipation, and dry mouth, with a possible increased risk of orofacial clefts in babies exposed to topiramato during the first trimester of pregnancy 1, 2
Topiramato may reduce the efficacy of hormonal contraceptives, and women of childbearing age should be informed of this potential risk 5

The American Gastroenterological Association recommends gradual discontinuation of topiramato over a week or more to minimize the risk of seizures, and discontinuation of phentermine/topiramato if a 5% weight loss is not achieved after 12 weeks with the maximum dose 1, 2, 6