Flucloxacillin Capsule Side Effects in Pakistan

Complete guide to Flucloxacillin (Floxapen / Fluclox) side effects — from common effects to serious warnings, with essential information about cholestatic hepatitis risk.

Compiled by the PakVita Editorial Team · AI-assisted drafting with editorial review · Sourced from DRAP, WHO, BNF · Last updated: 2026-06-17

Side Effects

Quick Answer

Flucloxacillin common side effects include nausea, diarrhea, abdominal pain, and rash. The most serious side effect is cholestatic hepatitis — jaundice, dark urine, pruritus — which can occur during treatment or up to 6 weeks after stopping. If jaundice appears, see a doctor immediately and stop the medicine.

Side Effects at a Glance

Common

Nausea, vomiting (matli, ulti)
Diarrhea (dast)
Abdominal pain
Urticaria / rash (charm pashi, daaney)
Oral / vaginal candidiasis (fungal overgrowth — Candida)

Serious — See a Doctor

Cholestatic hepatitis
Anaphylaxis (severe penicillin allergy — throat swelling, breathing difficulty, severe rash)
Clostridioides difficile colitis
Blood dyscrasias — neutropenia, thrombocytopenia (rare)

When to See a Doctor Immediately

Jaundice — yellowing of skin or eyes
Dark urine + pale stools + itching
Severe rash, facial/throat swelling, breathing difficulty (anaphylaxis — EMERGENCY)
Severe watery or bloody diarrhea
Infection not improving after 3–4 days

Flucloxacillin Capsule Side Effects (Nuksanat)

Flucloxacillin (Floxapen / Fluclox) is well-tolerated in most patients when taken at the correct dose on an empty stomach. However, it is important to be aware of the risk of cholestatic hepatitis.

Common Side Effects (Aam Nuksanat)

Nausea, vomiting (matli, ulti)
Diarrhea (dast)
Abdominal pain
Urticaria / rash (charm pashi, daaney)
Oral / vaginal candidiasis (fungal overgrowth)

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

Serious Side Effects (Sanjeedah Nuksanat) — Zaroori Maloomat

Cholestatic Hepatitis — Sabse Zaroori Warning

Rare but characteristic — documented side effect of flucloxacillin
Symptoms: Jaundice, dark urine, pale (light) stools, pruritus (itching)
Timing: Can occur during treatment or up to 6 weeks after stopping
Risk factors: Elderly, females, high dose, prolonged course
Action: STOP THE MEDICINE IMMEDIATELY and see a doctor
Generally reversible — but can be serious; delays are dangerous

Anaphylaxis (Severe Penicillin Allergy)

Throat swelling, breathing difficulty, severe rash — EMERGENCY — go to hospital

C. diff Colitis

Severe watery or bloody diarrhea — see a doctor

Blood Dyscrasias (Rare)

Neutropenia, thrombocytopenia — with long-term use

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

Jaundice — yellowing of skin or eyes — see a doctor immediately, stop the medicine
Dark urine + pale stools + itching (cholestasis)
Severe rash, throat swelling, breathing difficulty (anaphylaxis — EMERGENCY)
Severe watery or bloody diarrhea (C. diff)
Infection not improving after 3–4 days

Side Effects Summary Table

Type	Side Effect	Action
Common	Nausea / diarrhea / abdominal pain	Monitor / inform doctor
Common	Rash / urticaria	Inform your doctor
Serious	Cholestatic hepatitis (jaundice)	Stop immediately + see doctor
Serious	Anaphylaxis	EMERGENCY — hospital
Serious	C. diff colitis	See a doctor

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

Flucloxacillin ke sabse aam side effects kya hain?

Common side effects include nausea, diarrhea, abdominal pain, and rash. These are generally mild. If they continue, inform your doctor.

Flucloxacillin se jaundice kyun ho sakti hai?

Flucloxacillin has a rare but characteristic side effect of cholestatic hepatitis — due to inflammation of the bile duct. Symptoms are jaundice, dark urine, pale stools, and pruritus (itching). It can occur up to 6 weeks after treatment. See a doctor immediately and stop the medicine.

Flucloxacillin lene ke kitne time baad jaundice ho sakti hai?

Cholestatic hepatitis can occur during treatment or up to 6 weeks after stopping. Therefore, monitor for these symptoms even after treatment ends.

Kya flucloxacillin se severe allergic reaction ho sakti hai?

Yes — anaphylaxis is possible with the penicillin class (throat swelling, breathing difficulty, severe rash). This is a medical emergency — go to hospital immediately. Patients with a history of penicillin allergy must inform their doctor.

Flucloxacillin aur diarrhea — kya normal hai?

Mild diarrhea is common. Severe watery or bloody diarrhea may be a sign of Clostridioides difficile (C. diff) — see a doctor immediately.

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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.