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Weight management in adults: Mysimba in addition to reduced-calorie diet and physical activity, recommended for approval

The European Medicines Agency ( EMA ) has recommended granting a marketing authorisation for Mysimba ( Naltrexone / Bupropion ) for weight management of overweight or obese adults. The medicine is recommended for use in addition to a reduced-calorie diet and physical activity.

Mysimba provides a treatment option for adults with a body mass index ( BMI ) of 30 kg/m2 or greater ( obese ), or a BMI of 27 kg/m2 to less than 30 kg/m2 ( overweight ) in the presence of one or more complications related to their weight, such as type 2 diabetes mellitus, high cholesterol or high blood pressure.

Being overweight or obese is a major risk factor for a number of chronic diseases, including diabetes mellitus and cardiovascular disease. Currently, pharmacological therapies for weight management are limited.

Mysimba is a prolonged release tablet to be taken orally. It is a combination of two active substances ( Bupropion and Naltrexone ) already approved for use in the European Union ( EU ) in other indications.
These active substances affect two key areas of the brain responsible for the control of food intake and energy expenditure, and for the reward pathways associated with eating food.

The effectiveness of Mysimba was assessed in four pivotal studies that included obese and overweight patients with and without weight-related conditions treated for one year. All patients enrolled in trials were required to change their lifestyle to incorporate a reduced-calorie diet and regular physical activity. Across these studies, more patients treated with Mysimba achieved clinically-relevant weight loss than patients treated with placebo.

The main safety and tolerability concerns identified with Mysimba were related to central nervous system and gastrointestinal adverse events, and uncertainties with regard to cardiovascular outcomes in the longer term.
Interim results from an ongoing cardiovascular outcome trial were reassuring in terms of risk of serious cardiovascular disease related to treatment with Mysimba.
A second study is planned in order to continue monitoring longer-term cardiovascular safety with the medicine.

The CHMP recommended that patients started on Mysimba should be evaluated after 16 weeks. If a patient has not lost at least 5% of their initial body weight by this time, treatment with Mysimba should be stopped. ( Xagena )

Source: EMA, 2014