this is an independent prescribing paper which critically analyses a case study of a client who abused heroin. this will include the differential diagnosis and the final diagnosis. this will use a calgary cambridge model for consultation. and will analyze the choice of medication used will discuss the pharmacokinetics of the medication and the.pharmacodynamics. To include drug interactions, cautions and contra indications. this has to include current referencing and has to be Harvard referencing.consultation 1000 words and critical analysis 200words altogether 3000 words