Roberto A. Ferdman wrote about the effects that weight loss drugs have:

• It is thought that those who take weight loss pills such as appetite suppressants may end up gaining weight because they feel that they no longer have to watch what they eat or how much they exercise.
• New research indicates that merely being exposed to an advert for a weight loss pill drives people to eat worse – even if they didn’t actually take the pill.
• It seems that being told that there is a potential remedy for weight gain out there persuades people that they don’t have to worry too much about gaining weight.
• This effect disappears when pills are advertized as supplements instead of drugs.
• This might be because drugs are seen as something that work without any effort on the user’s part, unlike supplements.

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Source: The Washington Post