Metformin Viatris (Metformin Hydrochloride)

Metformin Viatris is indicated for conditions within the diabetes and glucose‑regulation pathway.

• Type 2 diabetes mellitus: improves fasting and post‑prandial glucose levels and aids long‑term glycaemic control.
• Prediabetes (impaired glucose tolerance): may be used to delay progression to overt diabetes.
• Polycystic ovary syndrome (off‑label): can help reduce insulin resistance and improve ovulatory function.

• Metformin reduces hepatic gluconeogenesis and increases peripheral glucose uptake by activating AMP‑activated protein kinase (AMPK). This leads to decreased hepatic glucose production, enhanced insulin‑mediated glucose utilization in muscle, and lowered intestinal glucose absorption, collectively resulting in reduced blood glucose concentrations.

Metformin may cause a range of adverse reactions, most of which are mild and transient.

Common Side Effects

• Nausea: mild to moderate stomach upset.
• Diarrhea: loose stools, especially during treatment initiation.
• Abdominal discomfort: cramping or bloating.
• Metallic taste: transient alteration in taste perception.

Serious or Rare Side Effects

• Lactic acidosis: a rare but life‑threatening metabolic disturbance.
• Severe hypoglycaemia: usually when combined with other glucose‑lowering agents.
• Hepatic dysfunction: abnormal liver enzymes or hepatitis.
• Severe skin reactions: such as Stevens‑Johnson syndrome.
• Pancreatitis: inflammation of the pancreas.
• Anemia: unexplained reduction in red blood cells.

When prescribing Metformin Viatris, clinicians should consider several safety measures.

• Renal function monitoring: assess creatinine clearance before initiation and periodically thereafter.
• Hepatic function assessment: evaluate liver enzymes to reduce risk of lactic acidosis.
• Lactic acidosis risk: avoid use in patients with conditions predisposing to hypoxia or severe infection.
• Concomitant hypoglycaemic agents: adjust doses of sulfonylureas or insulin to prevent low blood sugar.
• Patient education: inform about symptoms of lactic acidosis and hypoglycaemia.
• Store at ambient temperature: keep in the original container, protect from moisture and heat.

Metformin Viatris can interact with several medicines, requiring careful management.

Major Interactions (Avoid)

• Iodinated contrast media: may precipitate acute renal failure and increase lactic acidosis risk.
• Cimetidine: can raise metformin plasma concentrations.
• Alcohol excess: enhances risk of lactic acidosis.

Moderate Interactions (Monitor Closely)

• NSAIDs: may impair renal function, affecting metformin clearance.
• Loop diuretics: can reduce renal perfusion, necessitating dose review.
• Beta‑blockers: may mask hypoglycaemia symptoms.
• Corticosteroids: can increase blood glucose, requiring dose adjustments.
• Thyroid hormones: may alter metabolic rate and glucose handling.