Will taking medication that's expired by six months cause any problems?

In general, taking medication that has been expired for six months may cause problems. The specific analysis is as follows:

After expiration, the active ingredients in medications may degrade or deteriorate, leading to reduced efficacy and failure to achieve the intended therapeutic effect. For example, expired antibiotics may no longer effectively kill bacteria, delaying proper treatment of infections. For conditions requiring strict control of drug levels—such as diabetes or hypertension—taking expired medications may result in poor disease control and worsening of the condition. Expired medications may also produce harmful substances. During storage, drugs can undergo chemical changes due to factors like temperature, humidity, and light exposure, potentially generating toxic compounds. Taking such expired medications may trigger adverse reactions including allergic responses, gastrointestinal discomfort, or poisoning. Symptoms might include rash, itching, nausea, vomiting, abdominal pain, and diarrhea; in severe cases, it could even be life-threatening.

Medications should always be stored according to the instructions provided. Regularly check the expiration dates of your medicines, and properly dispose of any expired drugs—never consume them.