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Taking medication 30 minutes before exercising is a recommended practice for asthma sufferers because it allows the medication sufficient time to take effect. This is especially important for individuals who use a bronchodilator, which works by relaxing the muscles in the airways and opening them up, making breathing easier.

By timing the dosage appropriately, individuals can maximize their breathing capacity and minimize the risk of exercise-induced bronchoconstriction, which can occur in some asthma patients during physical activity. The 30-minute window provides a good balance, ensuring that the medication has begun to act effectively by the time the exercise starts.

In contrast, taking medication too close to the time of exercise may result in inadequate relief from symptoms, whereas taking it too far in advance could lead to a waning effect, potentially compromising respiratory function during the workout. Therefore, a 30-minute wait is ideal for managing asthma symptoms during exercise.