Before you take up a new medication the doctor should provide a risk benefit analysis. In this situation the doctor will inform you of the potential positives and negatives. After you receive this information. It is the your decision if you wish to take another medicine. Remember, the doctor has your best interest at hear, but in the end it is your decision.
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I apologized for not being familiar with what I thought the U.K. system. But in no place of the civilized world does one have to take meds unless a court order that it is in the patient's best interest. I do not believe that this is the case here. So my for for the sake of expediency you should not have to give up your rights re: medication.