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Clinical pharmacology play an important role in ensuring effective and inofensive pharmacotherapy. The administration of a adjusted treatment according to the pharmacokinetic and pharmacodynamic peculiarities of the drug, as well as the patient’s condition is indispensable. The rational use of medicines would increase the patient’s quality of life, as well as has important financial and public health benefits. Excessive, unreasonable prescription of drugs, polypharmacy, misuse of drugs, including expensive and unnecessary are the most common problems of irrational drug use. Many efforts have been made to improve drug use, but few evaluations have been carried out in this area. Identifying the problems that lead to irrational drug use and awareness of the importance of clinical pharmacology could ensure safe and effective pharmacotherapy.

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