Budesonide

Key facts

• Budesonide is a corticosteroid: inhaled for asthma and COPD, sprayed into the nose for allergic rhinitis, swallowed as a controlled-release capsule for Crohn's disease and ulcerative colitis, or applied to the skin for eczema.
• It controls inflammation over time and does not relieve a sudden asthma attack; you still need a fast-acting reliever inhaler for emergencies.
• After weeks or months of regular use, especially at higher doses, stopping suddenly can cause adrenal insufficiency, a potentially dangerous drop in the body's own cortisol. Doses must be tapered down under medical guidance, never stopped abruptly.
• Rinse your mouth and spit after each inhaler dose to prevent oral thrush and a hoarse voice.

What budesonide treats

Budesonide treats asthma and chronic obstructive pulmonary disease when inhaled, allergic rhinitis (hay fever and year-round nasal allergy) when sprayed into the nose, and mild to moderate Crohn's disease or ulcerative colitis affecting the last part of the small bowel and colon when taken as a delayed-release capsule that releases the drug where the gut inflammation is. A topical form treats localized eczema and other inflammatory skin conditions.

How budesonide works

Corticosteroids switch off the signals inside cells that produce inflammatory chemicals. Budesonide binds to steroid receptors in the airway lining, nasal passages, gut wall, or skin, reducing swelling, mucus production, and immune activity where it's applied, while only a small amount reaches the rest of the body compared with older oral steroids.

Before you take it

• Tell your prescriber about any active infection, especially tuberculosis, untreated fungal infections, or a recent live vaccine, since corticosteroids dampen the immune response.
• Mention any history of glaucoma, cataracts, or diabetes, since long-term use can affect eye pressure and blood sugar.
• Children on long-term inhaled or nasal budesonide should have their growth checked periodically.
• Carry a steroid treatment card if you're on a higher, longer-term dose, so other clinicians know to consider your adrenal status in an emergency.

Side effects

Common effects include a hoarse voice, throat irritation, oral thrush, or nasal dryness and occasional nosebleeds with the nasal spray.

Stop and seek urgent medical care for any of these:

• Severe wheeze or breathlessness that doesn't respond to your reliever inhaler.
• Facial swelling, hives, or difficulty breathing.
• Signs of adrenal crisis: extreme fatigue, dizziness, low blood pressure, or collapse, especially after missing doses or during illness.

Safety essentials

• Never stop long-term budesonide abruptly. Withdrawal after weeks or months of regular use must be tapered by a doctor to avoid adrenal insufficiency.
• During serious illness, injury, or surgery, your prescriber may need to temporarily raise your steroid dose to cover the added physical stress.
• Long-term use, especially at high doses, is monitored with periodic checks of growth in children, bone density, blood pressure, blood sugar, and eye pressure.

This page is educational and does not replace advice from a doctor or pharmacist who knows your health history.