Drug interactions
Fluphenazine + Metformin-sitagliptin
Severity: Minor
Fluphenazine and Metformin-sitagliptin: 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
Phenothiazine antipsychotics can cause hyperglycemia and impaired glucose tolerance, though fluphenazine is less implicated than newer atypical agents. Glycemic control may deteriorate in some patients with diabetes.
What this interaction means in plain words
Fluphenazine and Metformin-sitagliptin have a small, usually unimportant interaction. Most people can take both; the pharmacist may still mention it so that any unexpected effect is recognised.
Fluphenazine belongs to Central Nervous System; Metformin-sitagliptin belongs to Endocrine.
Why it happens
Dopamine and other receptor blockade by fluphenazine may reduce insulin secretion and sensitivity, opposing the antidiabetic effect.
What to do
Monitor glucose and HbA1c after starting fluphenazine and adjust antidiabetic therapy if control worsens.
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 Fluphenazine
- Arsenic trioxide + Fluphenazine Contraindicated
- Dofetilide + Fluphenazine Contraindicated
- Fluphenazine + Ibutilide Contraindicated
- Fluphenazine + Pimozide Contraindicated
- Adagrasib + Fluphenazine Major
- Alfentanil + Fluphenazine Major
Frequently asked questions
Can I take Fluphenazine with Metformin-sitagliptin?
MediHelp rates the interaction as minor. Fluphenazine and Metformin-sitagliptin have a small, usually unimportant interaction. Most people can take both; the pharmacist may still mention it so that any unexpected effect is recognised. Phenothiazine antipsychotics can cause hyperglycemia and impaired glucose tolerance, though fluphenazine is less implicated than newer atypical agents. Glycemic control may deteriorate in some patients with diabetes.
How serious is the interaction between Fluphenazine and Metformin-sitagliptin?
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 glucose and HbA1c after starting fluphenazine and adjust antidiabetic therapy if control worsens.
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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