Drug interactions
Metformin-sitagliptin + Phentermine
Severity: Minor
Metformin-sitagliptin and Phentermine: minor interaction.
Last updated
For healthcare professionals — reference only. This page is a brief summary, not medical advice and not a substitute for official labeling or clinical judgement. Always verify before prescribing or dispensing.
Summary
Phentermine is a sympathomimetic appetite suppressant that can change glucose requirements. Weight loss often lowers glucose, so hypoglycemia is uncommon with these agents but control may shift.
What this interaction means in plain words
Metformin-sitagliptin and Phentermine have a small, usually unimportant interaction. Most people can take both; the pharmacist may still mention it so that any unexpected effect is recognised.
Metformin-sitagliptin belongs to Endocrine; Phentermine belongs to Central Nervous System.
Why it happens
Sympathomimetic effects and weight loss alter glycemia in opposing directions.
What to do
Monitor blood glucose when phentermine is started or stopped. Adjust antidiabetic therapy if control changes.
What to ask your pharmacist
- Is there anything I should notice while taking both?
- Do I need to tell my doctor at the next visit?
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Other interactions of Metformin-sitagliptin
Other interactions of Phentermine
- Isocarboxazid + Phentermine Contraindicated
- Linezolid + Phentermine Contraindicated
- Phenelzine + Phentermine Contraindicated
- Phentermine + Procarbazine Contraindicated
- Phentermine + Rasagiline Contraindicated
- Phentermine + Selegiline Contraindicated
Frequently asked questions
Can I take Metformin-sitagliptin with Phentermine?
MediHelp rates the interaction as minor. Metformin-sitagliptin and Phentermine have a small, usually unimportant interaction. Most people can take both; the pharmacist may still mention it so that any unexpected effect is recognised. Phentermine is a sympathomimetic appetite suppressant that can change glucose requirements. Weight loss often lowers glucose, so hypoglycemia is uncommon with these agents but control may shift.
How serious is the interaction between Metformin-sitagliptin and Phentermine?
MediHelp rates it minor, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Monitor blood glucose when phentermine is started or stopped. Adjust antidiabetic therapy if control changes.
What other medicines interact with Metformin-sitagliptin?
MediHelp also lists interactions of Metformin-sitagliptin with, for example, Clozapine, Contrast media, Diatrizoate meglumine / diatrizoate. The full list is on the Metformin-sitagliptin page.
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