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Metered-Dose Inhalers (MDIs) and Medication Shelf Life

Metered-dose inhalers (MDIs) are commonly prescribed for the treatment of respiratory conditions. Understanding the appropriate storage and usage guidelines is crucial for maintaining medication efficacy and patient safety.

Factors Affecting MDI Expiry

  • Manufacturing Date and Expiration Date: Each MDI is assigned a manufacturing date and an expiration date printed on the product packaging. The expiration date indicates the latest date the manufacturer guarantees the full potency and stability of the medication within the original, unopened container.
  • Environmental Factors: Exposure to extreme temperatures (heat or cold), humidity, and direct sunlight can degrade the active pharmaceutical ingredients (APIs) and propellant within the canister, potentially reducing efficacy or altering the delivery system.
  • Post-Opening Usage Period: Once opened, the propellant within the canister may escape over time, leading to a decrease in the number of actuations available and a reduced ability to deliver the appropriate medication dose. This timeframe varies depending on the specific medication and the manufacturer's recommendations.

Recommended Storage and Handling

MDIs should be stored according to the manufacturer's instructions, usually at room temperature and away from direct heat, sunlight, and moisture. Avoid puncturing or crushing the canister. Patients should be aware of the signs of a malfunctioning inhaler, including difficulty actuating, and replace it promptly.

Determining Remaining Medication

Some MDIs include a counter that tracks the number of actuations remaining. Others may require visual inspection to estimate the remaining medication. Regular checking and adherence to the prescribed dosage schedule are essential. Patients should consult their pharmacist or healthcare provider for advice on the appropriate disposal of used MDIs.

Consulting Healthcare Professionals

Patients should always consult their pharmacist or healthcare provider for personalized guidance regarding the proper storage, use, and disposal of their prescribed MDIs. They can provide specific instructions based on the individual medication and patient needs. This information should not be considered a substitute for professional medical advice.