Cosylan Syrup Side Effects in Pakistan

A complete guide to the side effects of Cosylan Syrup. 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: 2026-07-09

Side Effects

Quick Answer

Common side effects of Cosylan Syrup include drowsiness, constipation, and nausea. Serious effects such as respiratory depression at high doses or dependency with prolonged use require immediate medical attention. Most patients tolerate Cosylan Syrup well at the correct dose. Contact your doctor if any side effect persists or worsens.

Side Effects at a Glance

Common

Drowsiness
Constipation
Nausea

Serious — See a Doctor

Respiratory depression (dangerously slow breathing) at high doses
Dependency risk with prolonged or excessive use
Severe allergic reaction (rare)

When to See a Doctor Immediately

If you experience difficulty breathing or unusually slow breathing
If you develop severe constipation or abdominal pain
If cough persists beyond 7 days without improvement

Cosylan Syrup Side Effects (Nuksanat)

Cosylan Syrup (Ethylmorphine Hydrochloride with Cascara and Menthol) is generally safe when taken at the correct dose for the recommended duration. However, like all medicines, it can cause side effects in some patients.

Common Side Effects (Aam Nuksanat)

Drowsiness
Constipation
Nausea

These side effects are usually mild at the recommended dose. If they continue or are troublesome, inform your doctor or pharmacist.

Serious Side Effects (Sanjeedah Nuksanat)

Respiratory depression (dangerously slow breathing) at high doses — seek emergency help immediately
Dependency risk with prolonged or excessive use — see a doctor immediately
Severe allergic reaction (rare) — see a doctor immediately

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

If you experience difficulty breathing or unusually slow breathing
If you develop severe constipation or abdominal pain
If cough persists beyond 7 days without improvement

Warnings and Precautions (Ihtiyat)

Do not exceed the recommended dose — contains ethylmorphine (opioid derivative)
Do not use with alcohol or sedatives
Do not use for more than 7 days without medical advice

Side Effects Summary Table

Type	Side Effect	Action
Common	Drowsiness	Avoid driving; monitor
Common	Constipation	Monitor; inform doctor if severe
Common	Nausea	Take with food; inform doctor if persistent
Serious	Respiratory depression	Emergency help immediately
Serious	Dependency	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 Cosylan Syrup?

The most commonly reported side effects of Cosylan Syrup are drowsiness, constipation, and nausea. These are usually mild at the recommended dose. Inform your doctor if they persist or are severe.

Can Cosylan Syrup cause allergic reactions?

Yes, like all medicines, Cosylan Syrup can rarely cause allergic reactions. Signs include rash, itching, swelling, or difficulty breathing. Stop use and seek medical help immediately if this happens.

Is Cosylan Syrup safe to take for a long time?

No. Cosylan Syrup should not be taken long-term without medical supervision. It contains ethylmorphine hydrochloride, an opioid derivative, which carries a risk of dependence with prolonged use.

What should I do if I experience side effects from Cosylan Syrup?

For mild side effects such as drowsiness, avoid driving or operating machinery. For serious effects such as breathing difficulty, stop the medicine and seek emergency medical help immediately.

Does Cosylan Syrup affect the liver or kidneys?

Cosylan Syrup may require caution in patients with significant liver impairment, as ethylmorphine is metabolised by the liver. Your doctor will advise on appropriate use based on your health condition.

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

Used for the same conditions

Other medicines commonly used for cough and overlapping conditions.

Cough 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.