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Phentermine is a prescription medication used short-term along with a doctor-approved, reduced-calorie diet, exercise, and behavior change program for weight loss.


Phentermine is classified as an anorexiant and a sympathomimetic medication, meaning it stimulates the body's sympathetic nervous system to decrease appetite.


Phentermine users can expect to lose between 5-10% of their body weight over 8 weeks, with common side effects including dry mouth, insomnia, dizziness, and elevated heart rate and blood pressure.

Expected Weight Loss Over 8 Weeks
Side Effects
5-10% of body weight
Reduces hunger and food intake
Nausea, diarrhea, constipation, voimiting, potential risk of thyroid C-cell tumors
2-5% of body weight
Decreases appetite and cravings
Nausea, constipation, headache, voimiting, dizziness, insomina, dry mouth, diarrhea
5-10% of body weight
Appetite suppression
Dry mouth, insomina, dizziness, elevated heart rate and blood pressure
5-10% of body weight
Reduces appetite and can make food seem less appealing
Dizziness, altered taste, insomina, constipation, dry mouth, tingling of hands and feet
HCG injections
Varies (not universally accepted as effective)
May supress hunger
Fatigue, irritability, restlessness, depression, fluid buildup(edema), swelling of the breasts in boys and me (gynecomastia)
Varied (limited evidence on effectiveness)
May aid in fat breakdown and metabolism
Mild diarrhea, upset stomach, rash at the injection site, nausea


The advantage of Phentermine over other weight loss drugs might be its simplicity as a single-ingredient medication, which may reduce the risk of complex interactions or side effects associated with multi-ingredient drugs.

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