Phentermine is a prescription weight loss medication that is classified as an appetite suppressant. It works by increasing the levels of certain neurotransmitters in the brain, such as dopamine and norepinephrine. This can lead to a decrease in appetite and an increase in energy levels. Phentermine is typically taken for 12 weeks at a time, and it is not recommended for long-term use.
There are a number of other prescription weight loss medications that are available, including:
- Orlistat (Xenical)
- Liraglutide (Saxenda)
- Bupropion and naltrexone (Contrave)
Each of these medications has its own unique set of benefits and risks, so it is important to talk to your doctor about which one is right for you.
Here is a comparison of phentermine and some of the other most commonly prescribed weight loss medications:
| Medication | Brand name | FDA approval | Mechanism of action | Side effects |
|---|---|---|---|---|
| Phentermine | Adipex-P, Fastin, Ionamin | 1959 | Appetite suppressant | Increased heart rate, anxiety, insomnia, dry mouth, constipation, dizziness |
| Orlistat | Xenical | 1999 | Blocks the absorption of fat | Stomach pain, oily stools, gas, diarrhea |
| Liraglutide | Saxenda | 2014 | Increases the feeling of fullness | Nausea, vomiting, diarrhea, constipation, headache |
| Bupropion and naltrexone | Contrave | 2014 | Reduces appetite and cravings | Nausea, vomiting, constipation, headache, dizziness |
It is important to note that all of these medications can have serious side effects, so it is important to talk to your doctor before taking any of them.
In addition to prescription medications, there are also a number of over-the-counter (OTC) diet pills available. However, the evidence for the effectiveness of OTC diet pills is limited, and they may have side effects that are similar to those of prescription medications.
If you are considering taking a weight loss medication, it is important to talk to your doctor about the risks and benefits of all of your options.
