Duova Inhaler (Tiotropium Bromide/Formoterol)

What is Duova Inhaler?

Duova Inhaler is a fixed‑dose combination bronchodilator used for maintenance treatment of COPD (chronic obstructive pulmonary disease). It contains:

• Tiotropium (a LAMA: long‑acting muscarinic antagonist)
• Formoterol (a LABA: long‑acting beta2 agonist)

Together they relax airway muscles and keep airways open for easier, longer‑lasting breathing control. Note: exact microgram strengths can vary by country/brand. Always check your pack label.

How it works

• Formoterol: starts working within minutes to open airways; lasts about 12 hours.
• Tiotropium: adds sustained bronchodilation and symptom control over 24 hours.
  The combo improves day‑to‑day breathlessness, exercise tolerance, and reduces flare‑ups in COPD.

Who can use it

• Adults with COPD (chronic bronchitis/emphysema) needing long‑acting bronchodilation
• Not for children
• Use in asthma only under specialist guidance and with an ICS on board

Dosage and schedule

• Typical regimen: 2 inhalations twice daily (morning and evening), or exactly as on your prescription label.
• Do not exceed prescribed doses. Don’t stop suddenly without medical advice.
• Missed dose: take it when you remember unless it’s close to the next dose—don’t double up.

How to use the MDI correctly

1. Shake well before each use.
2. Prime before first use (and if unused for several days): spray into the air until a fine mist appears (see your leaflet for the exact number of priming sprays).
3. Breathe out fully, away from the mouthpiece.
4. Seal lips around the mouthpiece. Start a slow, deep breath in, then press the canister once and continue inhaling steadily to fill your lungs.
5. Hold your breath for about 10 seconds, then breathe out slowly.
6. If a second puff is prescribed, wait ~30–60 seconds and repeat.
7. Replace the cap. Clean the mouthpiece weekly (nozzle down) and let it air‑dry.

Tips

• If coordination is tricky, ask about using a spacer compatible with your inhaler.
• Don’t spray into your eyes (antimuscarinics like tiotropium can worsen narrow‑angle glaucoma).
• If you cough right after a puff, pause, breathe normally, then try again more gently but still deep and slow.

Side effects

Common

• Dry mouth, throat irritation, cough, hoarseness
• Headache
• Mild tremor, palpitations, nervousness (from formoterol)

Less common/serious

• Paradoxical bronchospasm (worsening wheeze immediately after a dose stop and seek urgent care)
• Fast/irregular heartbeat, chest pain
• Urinary retention or difficulty passing urine (risk higher in prostate enlargement or bladder‑neck obstruction)
• Eye pain/blurred vision, halos (possible angle‑closure attack urgent care)
• Low potassium with frequent/high beta‑agonist exposure: cramps, palpitations
• High blood sugar, especially if diabetic
  Seek urgent help for severe chest symptoms, sudden breathing worsening, eye pain/vision changes, or inability to urinate.

Warnings and precautions

• Not a rescue inhaler. If you’re using your reliever more often, waking at night breathless, or activity is limited, book a review.
• Tell your clinician if you have heart disease, arrhythmias, hypertension, hyperthyroidism, diabetes, narrow‑angle glaucoma, prostate enlargement/urinary retention, liver/kidney issues, or a history of paradoxical bronchospasm.
• Avoid using other anticholinergic inhalers (e.g., tiotropium, glycopyrronium) alongside Duova unless specifically told—this duplicates therapy.
• Pregnancy/breastfeeding: use only if benefits outweigh risks; stick to the lowest effective dose under medical guidance.

Interactions

• Beta‑blockers (propranolol) can blunt bronchodilator effect.
• Diuretics, xanthines, or frequent/high‑dose beta‑agonists can increase low‑potassium risk.
• MAO inhibitors or tricyclic antidepressants may potentiate formoterol’s cardiac effects.
• Other anticholinergics increase antimuscarinic side effects (dry mouth, urinary retention, glaucoma risk).
  Always share a complete list of medicines and supplements with your clinician.

Storage and device care

• Store at room temperature, away from heat and direct sunlight. Do not puncture or incinerate the canister.
• Keep the mouthpiece clean and dry; cap on when not in use.
• Keep out of reach of children.

Frequently Asked Questions

• Is Duova a rescue inhaler?
  No. Use your quick‑relief inhaler (e.g., salbutamol/albuterol) for sudden symptoms.
• How soon will I feel better?
  Formoterol may help within minutes; full day‑to‑day control improves over days to weeks of regular use.
• Can I use Duova if I have asthma?
  Not by itself. If considered, it must be combined with an inhaled corticosteroid and guided by a specialist.
• What if I get dry mouth?
  Sip water, use sugar‑free gum, and maintain good oral hygiene. If persistent or bothersome, tell your clinician.
• Can I use a spacer?
  Often yes—ask your pharmacist or clinician if a spacer is compatible with your specific inhaler.
• What if my symptoms aren’t controlled?
  Don’t self‑increase. Book a review to check inhaler technique, adherence, triggers, and whether your regimen needs adjustment.