Weight loss pill Belviq has been in the news recently, because of a Harvard medical study. It's been around a while, and it looks to be expensive at several hundred dollars per month, for a few KG weight-loss.
It is US FDA approved, but here's the last mention I can find in NZ from 2012:
"Medsafe has not received an application for consent to distribute Belviq in New Zealand, Ministry of Health media advisor Anna Chalmers said.
Before a medicine is approved here an application must be lodged outlining its safety, quality and efficacy."
Here's some info from WebMD
https://www.webmd.com/drugs/2/drug-164439/belviq-oral/details
Belviq
GENERIC NAME(S): Lorcaserin
"Lorcaserin is used with a doctor-approved exercise, behavior change, and reduced-calorie diet program to help you lose weight.
It is used by certain overweight people, such as those who are obese or have weight-related medical problems. Losing weight and keeping it off can lessen the many health risks that come with obesity, including heart disease, diabetes, high blood pressure, and a shorter life.
Lorcaserin belongs to a class of drugs known as serotonin receptor agonists.
It is thought to work by affecting a certain part of the brain that helps control your appetite.
...
Side Effects
Nausea, dry mouth, headache, dizziness, constipation, or tiredness may occur.
...
Precautions
Before using this medication, tell your doctor or pharmacist your medical history, especially of: diabetes, heart problems (such as heart valve disease, heart failure, slow heartbeat, heart block), kidney problems, liver problems, conditions that can increase the risk of prolonged/painful erections in men (such as Peyronie's disease, deformed penis, sickle cell anemia, multiple myeloma, leukemia)."
https://www.theguardian.com/society/2018/aug/27/weight-loss-drug-belviq-not-linked-to-heart-problems-finds-study
Weight-loss pill hailed as 'holy grail' in fight against obesity
US study of 12,000 people shows drug lorcaserin does not increase risk of serious heart problems
"A weight-loss pill has been hailed as a potential “holy grail” in the fight against obesity after a major study showed it did not increase the risk of serious heart problems.
Researchers say lorcaserin is the first weight-loss drug to be deemed safe for heart health with long-term use. Taken twice a day, the drug is an appetite suppressant which works by stimulating brain chemicals to induce a feeling of fullness.
A US study saw 12,000 people who were either obese or overweight given the pills or a placebo – with those who took the drug shedding an average of 4kg (9lbs) in 40 months.
Further analysis showed no big differences in tests for heart valve damage. "