Metformin Viatris (Metformin Hydrochloride)

Metformin Viatris is indicated for management of disorders related to glucose metabolism, primarily type 2 diabetes mellitus.

• Type 2 diabetes mellitus: improves glycaemic control by lowering fasting and post‑prandial blood glucose levels.

• Metformin reduces hepatic gluconeogenesis and increases peripheral glucose uptake by enhancing insulin sensitivity in muscle and adipose tissue. It activates AMP‑activated protein kinase (AMPK), which modulates key enzymes involved in carbohydrate and lipid metabolism, leading to decreased glucose production and improved utilization without stimulating insulin secretion.

Metformin Viatris may cause a range of adverse reactions.

Common Side Effects

• Nausea: mild to moderate stomach upset.
• Diarrhoea: frequent loose stools, especially during treatment initiation.
• Abdominal discomfort: cramping or bloating.
• Metallic taste: transient alteration in taste perception.
• Loss of appetite: reduced desire to eat.
• Vitamin B12 deficiency: gradual decrease with long‑term use.

Serious or Rare Side Effects

• Lactic acidosis: life‑threatening accumulation of lactate, presenting with rapid breathing and muscle pain.
• Severe skin reactions: such as Stevens‑Johnson syndrome or toxic epidermal necrolysis.
• Hepatic failure: marked liver enzyme elevation or liver dysfunction.
• Hypoglycaemia: rare when combined with other glucose‑lowering agents.
• Acute pancreatitis: sudden abdominal pain with elevated enzymes.

Before initiating Metformin Viatris, consider the following safety measures.

• Renal function assessment: avoid or adjust dose in patients with impaired kidney function.
• Hepatic function monitoring: use caution in those with liver disease.
• Lactic acidosis risk: discontinue before radiographic contrast procedures.
• Concomitant medication review: evaluate for drugs that may increase metformin levels.
• Elderly dose adjustment: start with lower dose and titrate slowly.
• Store at room 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 agents: may precipitate lactic acidosis; discontinue metformin before and after use.
• Alcohol excess: increases risk of lactic acidosis.
• Strong CYP450 inhibitors (e.g., trimethoprim): raise metformin plasma concentrations.

Moderate Interactions (Monitor Closely)

• Beta‑blockers: may mask hypoglycaemia symptoms.
• Diuretics: can affect renal clearance of metformin.
• Corticosteroids: may raise blood glucose, requiring dose adjustment.
• ACE inhibitors: monitor renal function and electrolytes.
• NSAIDs: may impair renal function, increasing metformin exposure.