A patient has been prescribed a metered dose inhaler with a duration of action of approximately 4–6 hours. He reports a bitter metallic taste after use. Which inhaled medication is most likely responsible for this side effect?

A patient has been prescribed a metered dose inhaler with a duration of action of approximately 4–6 hours. He reports a bitter metallic taste after use. Which inhaled medication is most likely responsible for this side effect?

• A. Salbutamol
• B. Ipratropium bromide
• C. Beclometasone
• D. Tiotropium

Answer: (B)

A bitter metallic taste after using an inhaler is a classic clue pointing to an anticholinergic inhaler, particularly ipratropium bromide. This medication typically has a short to intermediate duration of action, about 4–6 hours, which fits the scenario. The metallic taste happens because some of the drug is tasted in the oropharynx after inhalation. Other options don’t fit as well: a short-acting beta-agonist like salbutamol can have systemic effects such as tremor or tachycardia but isn’t characteristically linked to a metallic taste. Beclometasone, an inhaled corticosteroid, can cause issues like hoarseness or oral candidiasis rather than a metallic taste. Tiotropium is a longer-acting anticholinergic with a 24-hour duration, so the 4–6 hour window is less consistent with it. So the inhaled medication most likely responsible for the bitter taste, given the action duration, is ipratropium bromide.

A bitter metallic taste after using an inhaler is a classic clue pointing to an anticholinergic inhaler, particularly ipratropium bromide. This medication typically has a short to intermediate duration of action, about 4–6 hours, which fits the scenario. The metallic taste happens because some of the drug is tasted in the oropharynx after inhalation.

Other options don’t fit as well: a short-acting beta-agonist like salbutamol can have systemic effects such as tremor or tachycardia but isn’t characteristically linked to a metallic taste. Beclometasone, an inhaled corticosteroid, can cause issues like hoarseness or oral candidiasis rather than a metallic taste. Tiotropium is a longer-acting anticholinergic with a 24-hour duration, so the 4–6 hour window is less consistent with it.

So the inhaled medication most likely responsible for the bitter taste, given the action duration, is ipratropium bromide.