Private clinics should be stopped from mixing and dispensing medicine to prevent malpractice and better protect patients, a pharmacist group says. The Society of Hospital Pharmacists education director William Chui Chun-ming said some doctors put profits before patients' safety. Mr Chui said a good medical practice should not use transparent medicine, to avoid mixing errors. 'Many things are transparent, such as water and alcohol. If a medicine is also transparent, it is difficult to spot any mixing error,' he said. Mr Chui said mixing medicine at clinics was dangerous. 'Many doctors do so because they want to save money. It is always cheaper for them to do the dilution themselves.' He also urged doctors to standardise drug labelling. 'At present, many doctors use brand names to label their medicine, instead of generic names. It is very confusing to patients. For example, there are about 100 brand names for paracetamol.' Some doctors also asked pharmaceutical companies to produce the same medicine in different colours to make patients believe they were taking different drugs so they would return for consultations. 'I have seen paracetamol in green, orange and red,' Mr Chui said. But Medical Association president Choi Kin, rejected the criticism, saying some pharmaceutical companies used different brand names as part of business competition.