Common side effects of Gefitinib include Diarrhea (50), Vomiting (14), Nail bed infection (10). Serious side effects include Gastrointestinal perforation (22) and Perforation (20). Gefitinib is classified as Medicine. Always consult a doctor if side effects persist.

Side Effects GuideAI-VerifiedMedicine

Gefitinib Side Effects

Complete guide to Gefitinib side effects — what's common, what's serious, which body systems are affected, and when to see a doctor.

Body impact map

Common
Serious
9+
Common effects
7
Serious effects
4
Body systems

Common Side Effects

Usually mild · often resolve on their own

These side effects may occur in some patients taking Gefitinib. Most are mild and improve as your body adjusts. Tell your doctor if any persist or worsen.

Diarrhea (50)
Stomach / GI
Vomiting (14)
Stomach / GI
Nail bed infection (10)
Whole body
Nail infection (10)
Whole body
Mouth ulcer (10)
Stomach / GI
Mouth ulceration (10)
Stomach / GI
Tongue ulceration (10)
Stomach / GI
Eyelid edema (10)
Head / Brain
Rash (90)
Skin
Gas (58)
Stomach / GI

Serious Side Effects

Rare but urgent · seek immediate medical help

Stop taking Gefitinib and seek immediate medical help if any of the following occur. Call 112 for emergencies.

Emergency · 112
Gastrointestinal perforation (22)
Stomach / GI
Perforation (20)
Whole body
Stevens Johnson syndrome (12)
Whole body
Haemorrhage (4)
Whole body
Haemorrhagic cyst (4)
Whole body
Haemorrhagic cystitis (4)
Whole body
Toxic epidermal necrolysis (1)
Whole body

Not a complete list. Report any unusual symptoms to your doctor immediately.

How to Minimize Side Effects

Simple steps that help

  • Take Gefitinib exactly as prescribed by your doctor — never change the dose yourself.
  • Follow dosage timing instructions carefully (with food / empty stomach / at bedtime as directed).
  • Do not stop Gefitinib suddenly without consulting your doctor — sudden discontinuation can be risky.
  • Report any new or unusual symptoms to your doctor promptly — early detection prevents complications.
  • Check drug interactions with GoDavaii AI before starting any new medicine, supplement, or even herbal remedy.
  • Avoid alcohol while on Gefitinib unless your doctor has confirmed it is safe.
AI-Verified · Cross-checked against 40,000+ interaction database

Not medical advice

Individual responses to Gefitinib vary — age, weight, existing conditions, and other medicines all matter. Always consult your doctor for personalized advice. For emergencies, call 112.

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