The drug Phentermine is a prescription medicine that helps curb your appetite and support weight loss, especially for those struggling with obesity. It is mainly prescribed for people who are obese or overweight, especially if their obesity causes diseases like diabetes or increased blood pressure. It is not for the long term, but can be taken to start your weight loss program with a healthy diet, exercise, and other lifestyle changes.
How Phentermine Affects the Body and Brain
Phentermine works by changing the way your brain sends out hunger signals. It increases levels of specific brain chemicals like norepinephrine that make you feel satisfied and more alert. This will reduce your hunger and enable you to eat less, in addition to inhibiting excessive eating behaviors. It also acts as a mild stimulant, or in other words, more like caffeine, so it should give you a bit of an energy boost during the day. Because of this, you might find it easier to move around and burn more calories. Overall, Phentermine helps you with:
- Feeling less hungry
- Eat smaller portions
- Remaining more alert and energized
- But remember: it will only work best if you have a good eating plan and exercise.
Positive Effects of Taking Phentermine
When used appropriately under physician care, Phentermine can:
- Help you lose weight faster to begin with
- Increase energy
- Help you stay healthy with your habits
- Make it easy not to overeat
People who are having trouble with their hunger typically find Phentermine helpful in the first stage of losing weight, at least for a few weeks. It makes people feel more self-assured, active, and even improves the quality of sleep when weight is lost.
Possible Side Effects
- Like all medicines, Phentermine can have side effects.:
- Dry mouth
- Trouble sleeping
- Racing heartbeat
- Nervousness or jitters
- Headaches or slight mood changes
Most of these are minor and resolve once your body has adjusted to the medication. Drinking more water, avoiding caffeine, and taking it in the morning may reduce these side effects. If you are not feeling well or notice something different, always check with your doctor.
How Long Does Phentermine Stay in Your Body
Phentermine can last in your system for about 10 to 12 hours after you take it. That’s why doctors usually tell you to take it in the morning—so it won’t disrupt sleep. It can last in your system for about 2 to 4 days, based on:
- Your age
- Your weight
- How fast does your stomach digest food
- Your liver and kidney function
- How much water do you drink daily
Phentermine can still be found in a drug test by some individuals after several days. In extremely rare cases, traces remain for up to a week. If you’re facing a drug test or have medical issues, it’s a good idea to let your doctor or tester know that you’ve been prescribed Phentermine.