 Though it is a national formulary, it nevertheless also includes entries for some medicines which are not available under the NHS, and must be prescribed and/or purchased privately.A symbol clearly denotes such drugs in their entry.It is used by pharmacists and doctors (both general practitioners (GPs) and specialist practitioners), and by other prescribing healthcare professionals (such as nurses, pharmacy technicians, paramedics, and dentists); as a reference for correct dosage, indication, interactions and side effects of drugs.