These medications are clinically known as GLP-1 receptor agonists and similar compounds. If you’ve been wondering what are weight loss drugs called, you’re not alone. Many people search for this term daily, hoping to understand the options available for medical weight management. The short answer is that most prescription weight loss medications fall into categories like GLP-1 agonists, appetite suppressants, or fat absorption inhibitors. Let’s break down each type so you can speak confidently with your doctor.
Understanding the names behind these drugs is the first step. They aren’t just “diet pills” anymore—they are sophisticated treatments that target specific biological pathways. Your doctor might mention a brand name like Wegovy or a class name like GLP-1 receptor agonist. Both refer to the same category of medication.
What Are Weight Loss Drugs Called
When people ask what are weight loss drugs called, they usually expect a simple list. But the reality is more nuanced. These drugs have generic names, brand names, and classification names. For example, semaglutide is the generic name, while Ozempic and Wegovy are brand names. The class name is GLP-1 receptor agonist.
Here are the main categories of weight loss medications approved by the FDA:
- GLP-1 Receptor Agonists – These mimic a natural hormone that regulates appetite and slows digestion. Examples include semaglutide (Wegovy, Ozempic), liraglutide (Saxenda), and tirzepatide (Mounjaro, Zepbound).
- Appetite Suppressants – These work on the central nervous system to reduce hunger. Examples include phentermine (Adipex-P) and diethylpropion (Tenuate).
- Fat Absorption Inhibitors – These block some of the fat you eat from being absorbed. The only one in this class is orlistat (Xenical, Alli).
- Combination Drugs – These mix two active ingredients. Examples include naltrexone-bupropion (Contrave) and phentermine-topiramate (Qsymia).
Each category works differently. Your doctor will choose based on your health profile, weight goals, and any underlying conditions like diabetes or high blood pressure.
Glp-1 Receptor Agonists Explained
GLP-1 receptor agonists are currently the most talked-about weight loss drugs. They were originally developed for type 2 diabetes but showed significant weight loss as a side effect. Now, some are specifically approved for weight management.
These medications mimic the GLP-1 hormone, which does several things:
- Signals your brain that you are full
- Slows down how fast your stomach empties food
- Reduces blood sugar spikes after meals
The most common brand names include:
- Wegovy (semaglutide) – Approved specifically for weight loss
- Ozempic (semaglutide) – Approved for diabetes but used off-label for weight loss
- Saxenda (liraglutide) – Approved for weight loss
- Zepbound (tirzepatide) – Newer option approved for weight loss
- Mounjaro (tirzepatide) – Diabetes drug often used off-label for weight loss
These are injectable medications, usually taken once weekly. They have shown impressive results, with many people losing 15-20% of their body weight. However, they can cause side effects like nausea, vomiting, and diarrhea, especially when starting.
Appetite Suppressants And Their Names
Appetite suppressants are older drugs that work differently. They stimulate certain neurotransmitters in the brain to reduce hunger signals. These are typically used for short-term weight loss, often a few weeks to a few months.
Common appetite suppressants include:
- Phentermine (Adipex-P, Lomaira) – The most widely prescribed appetite suppressant
- Diethylpropion (Tenuate) – Similar to phentermine but less common
- Phendimetrazine (Bontril) – Another short-term option
- Benzphetamine (Didrex) – Used for short-term weight management
These drugs are controlled substances because they have potential for abuse. They can cause side effects like dry mouth, insomnia, increased heart rate, and jitteriness. They are not recommended for people with heart disease or uncontrolled high blood pressure.
Your doctor will likely only prescribe these for a few weeks. They are often used as a jump-start to help you establish healthy eating habits.
Fat Absorption Inhibitors: Orlistat
Orlistat is the only FDA-approved fat absorption inhibitor. It works by blocking about 25-30% of the fat you eat from being absorbed by your intestines. This undigested fat is then eliminated in your stool.
Orlistat comes in two strengths:
- Xenical – Prescription strength (120 mg)
- Alli – Over-the-counter strength (60 mg)
This drug is not for everyone. It can cause unpleasant side effects like oily stools, gas with discharge, and frequent bowel movements. These side effects are worse if you eat a high-fat meal. Many people find they need to reduce their fat intake to avoid these issues.
On the plus side, orlistat has a good safety profile and has been used for decades. It also has some cardiovascular benefits and can improve cholesterol levels.
Combination Weight Loss Medications
Combination drugs mix two active ingredients to target weight loss through multiple mechanisms. They are often more effective than single-ingredient drugs because they address different pathways.
Two main combination drugs are approved:
- Contrave (naltrexone-bupropion) – Naltrexone is used for addiction, and bupropion is an antidepressant. Together, they reduce appetite and cravings.
- Qsymia (phentermine-topiramate) – Phentermine suppresses appetite, while topiramate is an anticonvulsant that also reduces hunger and increases fullness.
These drugs are taken as pills, usually once or twice daily. They have shown good results, with average weight loss of 5-10% of body weight. However, they have potential side effects and contraindications.
Contrave can cause nausea, headache, and constipation. It should not be used by people with uncontrolled high blood pressure or seizure disorders. Qsymia can cause tingling in hands and feet, dry mouth, and insomnia. It also has a risk of birth defects, so women of childbearing age must use effective contraception.
How These Drugs Compare To Each Other
Now that you know what are weight loss drugs called, you might wonder which one is best. There is no single “best” drug—it depends on your individual situation. Here is a comparison based on key factors:
Effectiveness
GLP-1 agonists, especially semaglutide and tirzepatide, tend to produce the most weight loss. Clinical trials show average weight loss of 15-20% of body weight with these drugs. Combination drugs like Qsymia and Contrave produce 5-10% loss. Appetite suppressants and orlistat produce more modest results, around 3-5%.
Side Effects
GLP-1 agonists have significant gastrointestinal side effects, especially when starting. Appetite suppressants can cause cardiovascular side effects. Orlistat has digestive side effects. Combination drugs have a mix of side effects. You need to discuss these with your doctor to find what you can tolerate.
Cost And Insurance Coverage
GLP-1 agonists are expensive, often costing $1,000 or more per month without insurance. Many insurance plans cover them for diabetes but not for weight loss. Appetite suppressants are cheaper, often under $100 per month. Orlistat is the cheapest option, especially the over-the-counter version. Combination drugs fall in between.
Duration Of Use
Some drugs are approved for long-term use, while others are only for short-term. GLP-1 agonists and combination drugs are approved for chronic weight management. Appetite suppressants are typically limited to 12 weeks or less. Orlistat can be used long-term but many people stop due to side effects.
How To Talk To Your Doctor About These Medications
Knowing what are weight loss drugs called is only half the battle. You also need to know how to bring up the topic with your healthcare provider. Here are some steps:
- Be honest about your weight struggles – Tell your doctor that you have tried diet and exercise but need additional help.
- Ask specifically about medications – Say something like, “I’ve heard about GLP-1 agonists like Wegovy. Would that be an option for me?”
- Discuss your medical history – Your doctor will need to know about any health conditions, medications you take, and your weight loss goals.
- Ask about side effects and risks – Make sure you understand what to expect before starting.
- Inquire about cost and insurance – Ask if your insurance covers the medication and if there are patient assistance programs.
Your doctor may also recommend lifestyle changes alongside medication. These drugs work best when combined with a healthy diet and regular physical activity.
Off-Label Use Of Diabetes Drugs For Weight Loss
Many people ask what are weight loss drugs called when they hear about diabetes medications being used for weight loss. This is called off-label use, meaning the drug is prescribed for a purpose not specifically approved by the FDA.
Common diabetes drugs used off-label for weight loss include:
- Ozempic (semaglutide) – Approved for diabetes but widely used for weight loss
- Mounjaro (tirzepatide) – Approved for diabetes but often prescribed for weight loss
- Victoza (liraglutide) – Diabetes version of Saxenda
- Trulicity (dulaglutide) – Sometimes used off-label
Off-label use is legal and common, but insurance may not cover it. You may have to pay out-of-pocket. Also, the dosing for weight loss may be different than for diabetes. Your doctor will guide you on the appropriate dose.
Natural And Over-The-Counter Options
Some people prefer non-prescription options. While these are not as powerful as prescription drugs, they can still help. Common over-the-counter weight loss aids include:
- Alli (orlistat 60 mg) – The only FDA-approved OTC weight loss drug
- Glucomannan – A fiber supplement that expands in your stomach to promote fullness
- Green tea extract – Contains caffeine and antioxidants that may slightly boost metabolism
- Conjugated linoleic acid (CLA) – A fatty acid that may help reduce body fat
- Garcinia cambogia – A tropical fruit extract that may block fat production
Be cautious with supplements. They are not regulated by the FDA like prescription drugs. Their effectiveness is often minimal, and some can have side effects or interact with other medications.
Potential Risks And Side Effects
All weight loss medications come with risks. It is important to understand these before starting. Common side effects across all categories include:
- Nausea and vomiting
- Diarrhea or constipation
- Headache
- Dizziness
- Insomnia
- Dry mouth
More serious but rare side effects include:
- Pancreatitis (inflammation of the pancreas)
- Gallbladder problems
- Kidney injury
- Severe allergic reactions
- Increased heart rate
- Mood changes or suicidal thoughts
You should report any unusual symptoms to your doctor immediately. Do not stop taking medication without consulting your healthcare provider, as some drugs require tapering off.
Who Is A Candidate For Prescription Weight Loss Drugs
Not everyone qualifies for these medications. Generally, you need to meet certain criteria:
- Body mass index (BMI) of 30 or higher (obesity)
- BMI of 27 or higher with at least one weight-related condition (like type 2 diabetes, high blood pressure, or sleep apnea)
- You have tried diet and exercise without success
- You do not have medical conditions that contraindicate the drug
Your doctor will perform a thorough evaluation before prescribing. This may include blood tests, blood pressure checks, and a review of your medical history.
How Long Do You Need To Take These Drugs
Weight loss medications are not a quick fix. Most are intended for long-term use. When you stop taking them, you may regain weight if you have not established healthy habits.
Studies show that people who stop GLP-1 agonists often regain most of the weight within a year. This is why doctors recommend combining medication with lifestyle changes. The goal is to use the drug as a tool while you learn sustainable habits.
Some people take these drugs for years. Others use them for a shorter period to lose a significant amount of weight, then transition to maintenance. Your doctor will help you decide the best approach.
Frequently Asked Questions
What Are Weight Loss Drugs Called In Simple Terms?
In simple terms, they are called appetite suppressants, fat blockers, or GLP-1 agonists. The most common brand names are Wegovy, Ozempic, Saxenda, and Contrave.
Can I Get Weight Loss Drugs Without A Prescription?
Only one weight loss drug is available over-the-counter: Alli (orlistat 60 mg). All others require a prescription from a doctor.
Are Weight Loss Drugs Safe For Everyone?
No, they are not safe for everyone. People with certain medical conditions, like pancreatitis, thyroid cancer, or severe gastrointestinal problems, should not take them. Always consult a doctor.
How Much Weight Can I Expect To Lose With These Drugs?
Results vary. GLP-1 agonists can lead to 15-20% weight loss. Combination drugs produce 5-10% loss. Appetite suppressants and orlistat produce 3-5% loss on average.
Do Weight Loss Drugs Work Without Diet And Exercise?
They work best when combined with a healthy diet and regular physical activity. Relying solely on medication without lifestyle changes often leads to weight regain after stopping.
Knowing what are weight loss drugs called empowers you to have informed conversations with your healthcare provider. Whether you choose a GLP-1 agonist, an appetite suppressant, or a combination drug, the key is to find a treatment that fits your health needs and goals. Always work closely with a doctor to monitor progress and manage side effects. Weight loss medications are powerful tools, but they are most effective when used as part of a comprehensive plan that includes nutrition, exercise, and behavioral changes.