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DPP-4 + biguanide

Sitagliptin with metformin

Brand names: Janumet

Adult dose

Dose: 50/850mg or 50/1000mg PO BD
Route: PO
Frequency: BD

Dose adjustments

Renal

Avoid if eGFR <30; reduce 30–60

Clinical pearls

  • T2DM combination per NICE NG28
  • Suspend during acute illness/contrast

Contraindications

  • Type 1 DM
  • DKA
  • Severe renal/hepatic impairment
  • Hypoxic states
  • Pancreatitis history

Side effects

  • GI upset
  • Pancreatitis
  • B12 deficiency
  • Lactic acidosis (rare)
  • Hypoglycaemia (with sulfonylurea/insulin)
  • Hypersensitivity

Interactions

  • Iodinated contrast
  • Alcohol
  • Insulin/sulfonylureas

Monitoring

  • HbA1c
  • Renal function
  • B12

Reference: BNF; NICE NG28; https://bnf.nice.org.uk/drugs/sitagliptin-with-metformin/. Verify against your local formulary and the latest BNF before prescribing.

Related

Curated clinical cross-links plus same-class fallbacks.