Metformin Hydrochloride: Brands, Price & Uses in Bangladesh

Metformin Hydrochloride is indicated as an adjunct to diet and exercise for the management of type 2 diabetes mellitus. Evidence classification by strength of use:

Established / FDA-approved use

• Type 2 diabetes mellitus (first-line therapy): Metformin Hydrochloride is recommended by major diabetes guidelines (e.g., ADA) as the preferred initial pharmacologic agent, used alone or in combination with other antidiabetic agents (such as sulfonylureas, DPP-4 inhibitors, SGLT2 inhibitors, or insulin) when diet and exercise alone do not achieve adequate glycemic control.

Guideline-supported / commonly used adjunct or off-label uses

• Gestational diabetes mellitus: used under specialist supervision as an alternative or adjunct to insulin in selected patients, per some clinical protocols; this is not a universally FDA-approved indication and insulin remains preferred by many guidelines.
• Polycystic ovary syndrome (PCOS): commonly used off-label to improve insulin resistance and ovulatory function; not an FDA-approved indication.
• Prediabetes: may be considered off-label in select high-risk individuals to delay progression to type 2 diabetes, per some guideline recommendations, but is not FDA-approved for this use.

Metformin Hydrochloride does not by itself cause hypoglycemia and is not indicated for type 1 diabetes mellitus or diabetic ketoacidosis.

Type 2 Diabetes Mellitus - Adult Dose

Pediatric Dose (10 years and older)

Immediate-release: 500 mg twice daily with meals, titrated in increments of 500 mg weekly to a maximum of 2000 mg/day in divided doses. Extended-release formulations are generally not established for pediatric use below 18 years in many labels; refer to the specific product label.

Renal Impairment

Assess renal function (eGFR) before starting and at least annually thereafter:

• eGFR ≥ 45 mL/min/1.73 m²: no dose adjustment required.
• eGFR 30-45 mL/min/1.73 m²: initiation is not generally recommended; if already on Metformin Hydrochloride and eGFR falls into this range, benefit-risk should be reassessed and dose reduced (e.g., to half the maximum dose), with more frequent monitoring.
• eGFR < 30 mL/min/1.73 m²: Metformin Hydrochloride is contraindicated (see Contraindications).

Hepatic Impairment

Avoid use in patients with clinically evident hepatic impairment, as this increases the risk of lactic acidosis (see Precautions and Warnings).

Administration

Take Metformin Hydrochloride with meals/food to reduce gastrointestinal side effects. Extended-release tablets must be swallowed whole and not crushed, split, or chewed. Metformin Hydrochloride should be temporarily discontinued before or at the time of iodinated contrast imaging procedures and withheld for 48 hours afterward, restarting only after renal function has been confirmed stable (see Precautions and Warnings).

Side effects of Metformin Hydrochloride by frequency:

Very common / common

• Gastrointestinal effects: diarrhea, nausea, vomiting, flatulence, abdominal discomfort, and metallic taste - most common during initiation or dose escalation and usually transient; taking with food and gradual titration reduce these effects.

Less common

• Decreased vitamin B12 absorption/levels with long-term use (see Precautions and Warnings).
• Headache, asthenia.

Rare but serious

• Lactic acidosis - rare but potentially life-threatening (see Precautions and Warnings for full detail; boxed warning).
• Hypersensitivity reactions.