present perfect continuous

Codeine is an opioid painkiller that may be prescribed for certain types of pain, particularly when medicines such as paracetamol or ibuprofen alone have not worked adequately. It can also cause unwanted effects including sleepiness, constipation and breathing problems. When people search buy codeine pills, it is important to understand that codeine itself is prescription-only in the UK and should be obtained through an appropriate healthcare service. Codeine can become addictive when used regularly for longer periods, so treatment should follow the prescribed instructions. Alcohol and some other medicines can increase the risk of side effects, making it important to discuss other medicines or supplements with a doctor or pharmacist.

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