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The Medicines and Healthcare products Regulatory Agency (MHRA) has reclassified codeine linctus, a medicine used for the treatment of dry cough, from a pharmacy-only medicine (P) to a prescription-only medicine (POM) owing to the risk of dependence, addiction, and overdose. This implies that the dry cough syrup, which is also known as codeine oral solution, can only be dispensed upon the submission of a prescription at a pharmacy, rather than being accessible over the counter upon request. Patients are cautioned that as an opioid medicine, codeine can be addictive, and the risk of addiction may increase, particularly with prolonged use over an extended period. According to the medicines regulator, codeine is converted into morphine by the liver enzyme CYP2D6. In individuals identified as ultra-rapid metabolizers, this conversion from codeine to morphine occurs at a faster rate than in others. "If you want to stop taking it and have been taking codeine linctus for a long time, then it is important to reduce the amount you take slowly with the help of your prescriber," the agency said in its drug safety update issued on Tuesday, 20 February.