Flexin Tablet Side Effects in Pakistan

Flexin Tablet side effects — a complete guide. From common effects to serious warnings — everything you need to know is on this page.

Compiled by the PakVita Editorial Team · AI-assisted drafting with editorial review · Sourced from DRAP, WHO, BNF · Last updated: 2026-04-12

Side Effects

Quick Answer

Common side effects of Flexin Tablet include indigestion or heartburn and stomach pain. Serious effects such as severe stomach bleeding require immediate medical attention. Most patients tolerate Flexin Tablet well at the correct dose. Contact your doctor if any side effect persists or worsens.

Side Effects at a Glance

Common

Indigestion or heartburn
Stomach pain
Nausea

Serious — See a Doctor

Severe stomach bleeding
Allergic reactions
Breathing issue

When to See a Doctor Immediately

Severe stomach pain or bleeding
Allergic reactions like rash, swelling, or difficulty breathing
Shortness of breath

Flexin Tablet Side Effects (Nuksanat)

Flexin Tablet (Naproxen) is generally safe when taken at the correct dose. However, like all medicines, it can cause side effects in some patients.

Common Side Effects (Aam Nuksanat)

Indigestion or heartburn
Stomach pain
Nausea

These side effects are usually mild. If they continue, inform your doctor.

Serious Side Effects (Sanjeedah Nuksanat)

Severe stomach bleeding — see a doctor immediately
Allergic reactions — see a doctor immediately
Breathing issue — see a doctor immediately

When to See a Doctor (Kab Doctor Se Milna Zaroori Hai)

Severe stomach pain or bleeding
Allergic reactions like rash, swelling, or difficulty breathing
Shortness of breath

Warnings and Precautions (Ihtiyat)

Don't use Flexin Tablet if you:
Are allergic to Naproxen or other NSAIDs
Have had asthma attacks triggered by aspirin or other NSAIDs

Side Effects Summary Table

Type	Side Effect	Action
Common	Indigestion or heartburn	Monitor / inform doctor
Common	Stomach pain	Monitor / inform doctor
Common	Nausea	Monitor / inform doctor
Serious	Severe stomach bleeding	See a doctor immediately
Serious	Allergic reactions	See a doctor immediately

Reporting Side Effects

If you notice any unexpected side effect, report it on the DRAP pharmacovigilance portal: https://www.dra.gov.pk/pharmacovigilance

The information in this guide is for educational purposes only. If you notice any side effect, contact your doctor or pharmacist.

Frequently Asked Questions

What are the most common side effects of Flexin Tablet?

The most commonly reported side effects of Flexin Tablet include indigestion or heartburn and stomach pain. These are usually mild and go away on their own. Inform your doctor if they persist.

Can Flexin Tablet cause allergic reactions?

Yes, like all medicines, Flexin Tablet can cause allergic reactions in some people. Signs include rash, itching, swelling, or difficulty breathing. Stop use and seek medical help immediately if this happens.

Is Flexin Tablet safe to take for a long time?

Long-term safety depends on the condition and the patient. Your doctor will monitor for any signs of severe stomach bleeding if continued use is needed.

What should I do if I experience side effects from Flexin Tablet?

For mild side effects, inform your pharmacist. For serious effects such as severe stomach bleeding, stop the medicine and contact your doctor immediately or go to the nearest hospital.

Does Flexin Tablet affect the liver or kidneys?

Flexin Tablet may require dose adjustment in patients with liver or kidney impairment. Your doctor will advise based on your test results and overall health condition.

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

Brand alternatives

Other Naproxen brands available in Pakistan.

All brands →

Neoprox Tablet
Naproxen
Martin DowRx

Other nsaids (anti-inflammatory painkillers)

Sibling medicines in the NSAIDs (Anti-Inflammatory Painkillers) class.

All in class →

Used for the same conditions

Other medicines commonly used for headache and overlapping conditions.

Headache hub →

Sources

DRAP Registered Products Database — Drug Regulatory Authority of Pakistan
WHO Model List of Essential Medicines, 23rd ed. (2023) — World Health Organization
British National Formulary (BNF) — BMJ Group & Pharmaceutical Press

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.