Overview
Budesonide is a glucocorticoid corticosteroid used primarily for its anti-inflammatory and immunosuppressive effects. It is commonly prescribed for asthma, allergic rhinitis, and Crohn's disease, with formulations designed for targeted delivery to minimize systemic side effects. The drug works locally to reduce inflammation in affected tissues while having lower systemic bioavailability compared to traditional corticosteroids.
Mechanism of Action
Budesonide is a glucocorticoid that binds to intracellular glucocorticoid receptors, inhibiting the production of inflammatory mediators such as cytokines, chemokines, and adhesion molecules. This reduces inflammation, edema, and mucus secretion in target tissues like airways and gastrointestinal mucosa. Its delayed-release formulations provide localized action with minimal systemic absorption.
Indications
- Maintenance treatment of asthma as a prophylactic therapy
- Management of allergic rhinitis (seasonal and perennial)
- Treatment of mild to moderate Crohn's disease affecting the ileum and ascending colon
- Eosinophilic esophagitis (off-label/common use)
Common Doses
- Inhalation: 90 mcg, 180 mcg per actuation
- Nasal spray: 32 mcg per spray
- Oral capsules: 3 mg
- Delayed-release capsules: 9 mg
Dosage
Dosage varies by indication and formulation. For asthma: typically 180-360 mcg inhaled twice daily (adults) or 180 mcg twice daily (children). For Crohn's disease: 9 mg once daily in the morning for up to 8 weeks. For allergic rhinitis: 64 mcg per nostril once daily. Always titrate to the lowest effective dose.
Contraindications
- Hypersensitivity to budesonide or any components of the formulation
- Active untreated fungal, bacterial, or viral infections in the respiratory tract (for inhaled forms)
- Status asthmaticus or other acute asthma episodes requiring intensive measures
Side Effects
- Common: headache, pharyngitis, respiratory infection, nausea, cough
- Serious: adrenal suppression, osteoporosis, glaucoma, cataracts with prolonged use
- Hypersensitivity reactions including anaphylaxis
- Psychiatric effects such as mood changes, anxiety, or insomnia
- Increased risk of pneumonia in COPD patients (for inhaled forms)
Interactions
- Strong CYP3A4 inhibitors (e.g., ketoconazole, ritonavir) can increase budesonide levels and risk of systemic effects
- Concomitant use with other corticosteroids may increase risk of adrenal suppression
- Live vaccines should be avoided due to immunosuppressive effects
Counseling Points
- Rinse mouth after inhaled use to prevent oral thrush
- Do not use for acute asthma attacks; keep rescue inhaler available
- Take at the same time daily for consistent effect
- Report signs of infection, vision changes, or unusual mood swings
- Do not stop abruptly if used long-term; taper as directed