5 Diet Drugs: Which Ones Work? | WPN World People News

Any of the prescription weight-loss drugs on the market can help obese people shed pounds, although some seem more effective than others, a new study finds.

Currently, five drugs are approved in the United States for managing obesity. But little has been known about how they stack up against one another, said expert.

The findings -- based on more than 29,000 people in total -- show all five drugs can work. But people on certain drugs tended to be more successful, at least over one year.

Specifically, people using Qsymia (phentermine-topiramate) or Saxenda (liraglutide) had the highest odds of shedding at least 5 percent of their initial weight. Those taking Xenical (orlistat) had the lowest odds.

However, there is no single drug that's "best" for everyone, stressed expert.

Expert cautioned that the researchers team's numbers are just averages across study groups. Plus, expert said, the side effects of each medication vary, and that is an important factor in treatment decisions.

"Obesity treatment always needs to be personalized," expert said.

Expert agreed that people respond differently to any given weight-loss drug.

"In general, if you give drug 'X,' there will be a wide variation in patients' responses," said expert.

Some people will have "zero" weight loss -- or even gain weight -- while others will see the pounds drop off, expert said.

Expert also stressed that there is no such thing as a magic weight-loss pill.

"These drugs can help you eat less through effects on appetite," expert explained. "But you have to change your diet and get regular exercise."

"Medications are supplements, not substitutes, to your efforts," expert said.

For the study, the researchers team analyzed findings from 28 clinical trials testing the five approved drugs for obesity: Qsymia, Saxenda and Xenical, along with Belviq (lorcaserin) and Contrave (naltrexone-bupropion).

On average, the researchers found, each drug worked better than a placebo in helping obese adults lose weight over a year. But certain medications seemed more effective than others.

People on Qsymia typically lost the most weight -- almost 20 pounds more, versus study patients given placebo pills. They were also nine times more likely to drop at least 5 percent of their initial weight, the researchers found.

People taking Xenical or Belviq tended to shed the fewest pounds -- 6 to 7 pounds more than placebo users. Contrave and Saxenda patients typically lost 11 to 12 pounds more, compared with placebo.

But not everyone benefited. In studies of all of the drugs, Singh noted, a significant number of people dropped out because of side effects.

And those dropouts were more common with certain medications, the study found. People taking Contrave or Saxenda were almost three times more likely to quit a trial over side effects, compared with placebo users.

Just as people vary in their weight-loss success with any given drug, their risks of side effects will differ, too, expert said.

Expert pointed to Contrave as an example. Because it contains the antidepressant bupropion, it carries a boxed warning about the potential risk of suicidal thoughts. So it might not be the best choice for someone with psychiatric conditions that could make them more vulnerable, expert said.

Most of the medications have been approved only in the past few years, so one question is whether they maintain their effects over the long run, expert said.

"We do need more long-term data," expert agreed.

Still, he said, medications are an important option for managing obesity. And if one does not work, expert added and recommend trying another.

Source: HealthDay News