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Dulcolax, which contains the active ingredient bisacodyl, is primarily used as a laxative to treat constipation. It works by stimulating the muscles of the intestines, promoting bowel movements, and can be administered in both tablet and suppository forms. This effectiveness in relieving constipation makes it a common choice for those needing to alleviate digestive issues.

In contrast, the other options serve different health-related purposes. Preventing allergic reactions pertains to antihistamines or other allergy medications. Alleviating cough is typically managed by cough suppressants or expectorants. Relieving respiratory distress involves medications such as bronchodilators or corticosteroids to manage conditions affecting breathing, which is not related to the laxative properties of Dulcolax. Thus, understanding its specific use as a laxative highlights the importance of recognizing the appropriate applications of various medications.