What ingredients are in phentermine?
Phentermine is usually a single active ingredient drug used for short-term weight loss. The ingredient list typically contains:
- Phentermine hydrochloride (the active ingredient) [1]
- Inactive ingredients (excipients) that vary by brand and product form, such as tablet/capsule binders, fillers, and coatings [1]
Because inactive ingredients depend on the manufacturer and formulation, the exact “ingredients list” can differ between brands.
How to find the exact phentermine ingredient list on your bottle
To get the precise list for the specific product you have, check the “Drug Facts” panel on the packaging. It will list:
- Active ingredient: phentermine hydrochloride [1]
- Inactive ingredients: listed separately under “Inactive ingredients” [1]
If you tell me the brand name (or share the text from the Drug Facts panel), I can help you identify each ingredient.
Does the ingredients list differ between tablets and capsules?
Yes. Even when the active ingredient is the same (phentermine hydrochloride), inactive ingredients and possibly coatings can differ by dosage form (tablet vs. capsule) and by manufacturer [1]. That means allergy or sensitivity concerns can depend on the specific product.
Are there common allergens or fillers people ask about?
People often look for inactive ingredients if they have sensitivities. The Drug Facts panel is the reliable source because formulations vary. Check for any specific ingredient you avoid (for example, particular dyes, gelatin, starches, or other excipients) in the “Inactive ingredients” section [1].
Sources
- DailyMed – Search Results for Phentermine (Drug Label Information)