Metformin Zentiva (Metformin Hydrochloride)

• Metformin Zentiva is indicated for conditions within the diabetes mellitus disease family where glucose regulation is required.
• Type 2 diabetes mellitus: improves blood glucose control when combined with diet and exercise.
• Prediabetes (impaired fasting glucose): helps delay progression to overt diabetes.
• Polycystic ovary syndrome (off‑label): may improve insulin resistance and menstrual regularity.

• Metformin reduces hepatic gluconeogenesis and enhances peripheral glucose uptake by activating AMP‑activated protein kinase (AMPK). This leads to decreased hepatic glucose output and increased insulin‑mediated glucose utilization in muscle and adipose tissue, thereby lowering fasting and post‑prandial blood glucose levels without stimulating insulin secretion.

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

Common Side Effects

• Gastrointestinal upset: nausea, abdominal discomfort, or loss of appetite.
• Diarrhea: frequent loose stools, especially during treatment initiation.
• Metallic taste: transient alteration in taste perception.
• Flatulence: increased intestinal gas.
• Vitamin B12 deficiency: reduced absorption with long‑term use.
• Weight loss: modest reduction in body weight.

Serious or Rare Side Effects

• Lactic acidosis: rare but potentially fatal metabolic acidosis.
• Severe skin reactions: such as Stevens‑Johnson syndrome.
• Hepatic dysfunction: elevated liver enzymes or hepatitis.
• Hypoglycaemia: uncommon when used alone, but possible with other glucose‑lowering agents.
• Pancreatitis: inflammation of the pancreas.
• Anemia: due to folate deficiency.

• When prescribing Metformin, clinicians should consider several safety aspects.
• Renal function: assess eGFR before initiation and periodically thereafter.
• Lactic acidosis risk: avoid in patients with significant hepatic impairment or severe heart failure.
• Alcohol consumption: limit intake to reduce lactic acidosis risk.
• Pregnancy and lactation: discuss potential benefits and risks with the healthcare provider.
• Drug interactions: review concomitant medications that may affect renal clearance.
• Store at ambient temperature: keep in the original container, protect from moisture and direct sunlight.

Metformin may interact with other medicines, requiring careful management.

Major Interactions (Avoid)

• Iodinated contrast media: can precipitate acute renal failure and lactic acidosis.
• Cimetidine: may increase metformin plasma concentrations.
• Nitrates: combined use may raise the risk of lactic acidosis.

Moderate Interactions (Monitor Closely)

• Beta‑blockers: may mask symptoms of hypoglycaemia.
• Diuretics: can affect renal function and metformin clearance.
• ACE inhibitors or ARBs: monitor renal function and electrolytes during combined therapy.