Avoid alcohol-containing drinks while taking medicines that cause drowsiness like prescription pain medicines, medications to reduce anxiety, medicines to induce sleep or sedation, and medicines used for colds or allergies. Using some of these drugs along with alcohol can lead to serious side effects. You may feel drowsy or more tired when taking these drugs together. Do not drive or operate machinery if you are drinking alcohol-containing beverages. If you notice slurred speech, confusion, severe weakness, or difficulty breathing, contact your health care provider immediately.