Medicines can indeed cause side effects even when taken exactly as prescribed. This happens because each person's body can react differently to a medication, and some drugs have effects beyond their intended benefits.

• Side effects occur due to how the medicine interacts with your body’s unique chemistry or other medications you might be taking.
• It’s important to monitor how you feel after starting a new medicine and keep your doctor informed about any changes or symptoms.
• Most side effects are mild and improve over time, but never stop or change your medication without consulting your doctor.
• If you notice unusual or persistent symptoms, contact your prescribing doctor promptly to discuss them.
• Your doctor can help manage side effects or adjust treatment to keep you safe and comfortable.

If you want, I can explain how specific medicines like Concor COR (Bisoprolol) might cause side effects and what to watch for. Always consult your cardiologist or prescribing doctor for personalized advice.