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When you have a cold, you should get plenty of rest, drink more water, and maintain adequate sleep. According to the advice of a doctor or pharmacist, you may take medications such as fever reducers, pain relievers, or cough medicine to ease discomfort. If symptoms last for more than one week or become worse, seek medical attention as soon as possible. If you experience stomach pain, diarrhea, drowsiness, palpitations, chest tightness, skin rash, itching, swelling, or other discomfort after taking medicine, these may be side effects or allergic reactions. Stop taking the medicine immediately and consult a doctor or pharmacist to ensure medication safety.