Metformin Dosage Guide in Pakistan

Q: What dose should Metformin be started at?

500mg once daily with dinner — in the first week. Then 500mg twice daily (breakfast + dinner). Do not rush increasing the dose — this avoids stomach problems.

Q: What should the timing of Metformin and food be?

Always with food or immediately after. Taking on an empty stomach dramatically increases the chance of nausea and diarrhea.

Q: What is the maximum dose of Metformin?

2500mg per day (2–3 divided doses). Benefit from doses higher than this has not been proven and side effects increase.

Q: Does the Metformin dose change in kidney disease?

Yes. eGFR 45–60: max 1000mg/day, close monitoring. eGFR 30–45: max 500mg/day, caution. eGFR < 30: discontinue Metformin.

Q: Is the extended-release (XR/SR) version better?

Yes, extended-release Metformin (once daily at dinner) causes fewer stomach side effects and improves compliance. Same efficacy.

Taking Metformin at the correct dose and increasing it gradually is essential to reduce stomach side effects. This guide covers adult dose, elderly patients, dose adjustment in kidney disease, and missed dose guidance.

Compiled by the PakVita Editorial Team · AI-assisted drafting with editorial review · Sourced from DRAP, WHO, BNF · Last updated: 2026-04-27

Dosage Guide

Quick Answer

Metformin standard starting dose is 500mg once daily with dinner. After 1–2 weeks, increase to 500mg twice daily with meals. Usual maintenance is 500–850mg twice daily. Maximum dose is 2500mg/day in 2–3 divided doses. Always take with food to minimise stomach side effects.

Dose at a Glance

Adult Dose

500mg once daily, titrate to 500–850mg twice daily

Twice daily with meals (breakfast + dinner)

Max: 2500mg/day in 2–3 divided doses

Child Dose (10 years and above only)

Not recommended under 10 years

10+ years — as prescribed by paediatrician (10mg/kg/day starting)

Missed Dose

Take as soon as you remember if meal time is close. Do not take without a meal. If the next dose time is approaching, skip it. Never take a double dose.

Overdose

Lactic acidosis — shortness of breath, muscle weakness, stomach pain, body feeling cold. Contact emergency immediately.

Metformin Dosage

The most important thing about Metformin is — titrate the dose slowly. Whenever Metformin is started, gradually increasing the dose dramatically reduces stomach side effects (nausea, diarrhea).

Standard Adult Titration Schedule

Week	Dose	Timing
Week 1	500mg once daily	With dinner
Week 2–4	500mg twice daily	With breakfast + dinner
If needed	850mg twice daily	With breakfast + dinner
Max	850mg three times daily or 1000mg twice daily	With meals

Maximum dose: 2500mg/day. There is no proven benefit from taking more than this.

Immediate-Release vs Extended-Release

Form	Dosing	Advantage
Immediate-release (IR)	2–3 times daily with meals	Cheaper, widely available
Extended-release (XR/SR)	Once daily at dinner	Fewer GI side effects, better compliance

XR form especially recommended for patients who develop diarrhea on IR.

Special Populations

Elderly Patients (60+ years)

Start low: 500mg once daily
Monitor kidney function (eGFR) every 6 months
Dose adjust as eGFR changes

Kidney Disease

eGFR (mL/min/1.73m²)	Recommendation
≥ 60	Full dose (up to 2500mg/day)
45–59	Max 2000mg/day — monitor
30–44	Max 1000mg/day — caution, close monitoring
< 30	STOP — lactic acidosis risk

Hepatic Impairment

Mild/moderate: Use with caution
Severe liver disease: Avoid — lactate clearance impaired

Before Surgery or Contrast Scan

Discontinue Metformin 48 hours before CT scan or angiography. Also wait 48 hours after the procedure before restarting (confirm with doctor that kidney function is stable).

Missed Dose

Take as soon as you remember if you are eating or have just eaten
Do not take on an empty stomach
If the next scheduled dose time is approaching: skip it
Never double the dose

Overdose

Risk of lactic acidosis from Metformin overdose:

Symptoms: shortness of breath, severe weakness, stomach pain, body feeling cold, confusion
Go to hospital emergency immediately — N-acetylcysteine or dialysis may be needed

The information in this guide is for educational purposes only. Always confirm the dose with your doctor or pharmacist.

Frequently Asked Questions

What dose should Metformin be started at?

500mg once daily with dinner — in the first week. Then 500mg twice daily (breakfast + dinner). Do not rush increasing the dose — this avoids stomach problems.

What should the timing of Metformin and food be?

Always with food or immediately after. Taking on an empty stomach dramatically increases the chance of nausea and diarrhea.

What is the maximum dose of Metformin?

2500mg per day (2–3 divided doses). Benefit from doses higher than this has not been proven and side effects increase.

Does the Metformin dose change in kidney disease?

Yes. eGFR 45–60: max 1000mg/day, close monitoring. eGFR 30–45: max 500mg/day, caution. eGFR < 30: discontinue Metformin.

Is the extended-release (XR/SR) version better?

Yes, extended-release Metformin (once daily at dinner) causes fewer stomach side effects and improves compliance. Same efficacy.

Brand alternatives, same-class options, and other medicines used for the same conditions as Metformin Tablet.

Other diabetes medicines

Sibling medicines in the Diabetes Medicines class.

All in class →

Used for the same conditions

Other medicines commonly used for diabetes and overlapping conditions.

Diabetes hub →

Sources

BNF — Metformin Hydrochloride Dosage — BMJ Group & Pharmaceutical Press
DRAP Registered Products — Drug Regulatory Authority of Pakistan

Medical disclaimer

This page is for educational use only and does not replace professional medical advice. Always confirm diagnosis, dose, and interactions with a qualified doctor or pharmacist before starting or changing any medicine.