Question 1

How does Mysimba suppress appetite?

Accepted Answer

Mysimba increases the activity of POMC neurons in the hypothalamus, which produce α-MSH—a molecule that signals satiety. Naltrexone blocks opioid inhibition of these neurons, and bupropion directly stimulates them.

Question 2

How long does Mysimba stay in your system?

Accepted Answer

Bupropion has a half-life of about 21 hours, so it takes roughly 5 days to be eliminated after the last dose. Naltrexone is faster (5 hours), but its active metabolite 6β-naltrexol lasts longer (13 hours).

Question 3

Does Mysimba affect metabolism or just appetite?

Accepted Answer

Yes, Mysimba may slightly increase energy expenditure through sympathetic activation, but its primary effect is appetite suppression. The majority of weight loss comes from reduced calorie intake.

Question 4

Can Mysimba cause weight loss without diet and exercise?

Accepted Answer

Mysimba is approved only as an adjunct to a reduced-calorie diet and increased physical activity. It enhances adherence to lifestyle changes but is not effective on its own.

Question 5

Is Mysimba addictive?

Accepted Answer

Bupropion has a very low potential for abuse, and naltrexone blocks opioid receptors, so it does not cause dependence. However, do not stop suddenly without medical advice.