Side Effects of Itraconazole Capsules - Long-Term Use (3 Months, Twice Daily)

Common / Frequent Side Effects

• Gastrointestinal (GI) problems - nausea, vomiting, diarrhea, abdominal pain, indigestion, flatulence, loss of appetite
• Unpleasant or unusual taste in the mouth - this is a hallmark itraconazole side effect that often causes patients to stop taking it
• Headache and dizziness
• Rash, itching
• Swelling (edema) - especially in the legs or abdomen
• Fatigue / tiredness

Serious Side Effects - Require Immediate Medical Attention

1. Liver Toxicity (Hepatotoxicity)

• Elevated liver enzymes, jaundice (yellowing of skin/eyes), dark urine, pale stools, severe abdominal pain
• Rare cases of fulminant hepatitis and liver failure have been reported
• If you are on 3 months of continuous therapy, liver function tests (LFTs) should be monitored regularly - at baseline and at 1 month intervals
• Stop the medication and contact your doctor immediately if you notice any liver symptoms

2. Heart Problems (Negative Inotropic Effect)

• Itraconazole has a negative inotropic effect (weakens heart muscle contraction)
• Can cause or worsen heart failure / congestive cardiac failure
• Watch for: unexpected weight gain, swelling of legs/abdomen, shortness of breath, unusual fatigue, fast or irregular heartbeat
• Contraindicated in patients with existing heart disease

3. Triad in Elderly Patients

• Edema + Hypertension + Hypokalemia (low potassium) - this triad is especially seen in older patients on itraconazole
• Can cause muscle cramps, weakness, tingling, irregular heartbeat (from low potassium)

4. Peripheral Neuropathy

• Tingling or numbness in hands or feet
• If this develops, treatment is usually stopped

5. Hearing Problems

• Hearing loss - can be temporary or, in rare cases, permanent
• Stop medication and seek medical advice if hearing changes occur

6. Severe Skin Reactions

• Stevens-Johnson syndrome (rare but serious) - blistering rash, sores in mouth
• Severe allergic reactions (anaphylaxis) - difficulty breathing, facial swelling

7. Hormonal/Endocrine Effects

• Adrenal suppression (rare)
• Erectile dysfunction or impotence
• Changes in menstrual periods
• Hair loss

Drug Interactions to Watch Out For

• Calcium channel blockers (e.g., amlodipine, nifedipine) - itraconazole dramatically raises their levels
• Blood thinners (warfarin) - increased bleeding risk
• Statins (e.g., simvastatin) - risk of muscle damage (rhabdomyolysis)
• H2 blockers or proton pump inhibitors - reduce itraconazole absorption (less effective)
• Oral hypoglycemics / diabetic medications - blood sugar monitoring needed

Monitoring Required During 3-Month Course

When to Stop Immediately and See a Doctor

• Yellowing of skin or eyes (jaundice)
• Dark urine or pale stools
• Chest tightness, breathlessness, or swollen legs (heart failure signs)
• Severe rash or mouth sores
• Tingling/numbness in hands or feet
• Any hearing change

Important note: Three months of twice-daily itraconazole is a long, high-dose course. Always take it under medical supervision with regular monitoring. Do not stop or adjust the dose on your own - even if side effects seem mild - without talking to your doctor first.