After receiving undergraduate teaching on the pharmaceutical industry, many medical students set out on the wards determined never to interact with 'Big Pharma' reps, refusing all the gifts they were warned about and prescribing non-proprietary drugs as soon as they get their hands on a script.

It's quite a shock on a clinical placement to attend your first grand round (a discussion of an interesting case attended by medical staff of all disciplines) and find a rep politely chatting with the consultants in front of a banner for 'the revolution in bisphosphonates'.

They never have horns and rarely try to trick you into an all-expenses paid trip to Malibu in exchange for using their drug. It's often a hospital kitchen lunch and a smartly bound copy of a trial publication.

It's vital that from the start of medical education, students must be mindful of the cost of a free lunch. The evidence – the currency we deal with in medicine – tells us that exposure counts1, and research suggests that drug companies may spend up to twice as much on marketing as on research and development2.

Ben Goldacre, a doctor and campaigner for open and honest medicine, presents countless examples of evidence of the influence of drug reps on doctors' prescribing in his book Bad Pharma1. There are meta-analyses highlighting poor practice and horror stories of industrial secrecy and conflict of interest, but less advice on how medical students can adopt positive practice – not necessarily easy when the status quo is a weekly free meal.

Students must be mindful of the cost of a free lunch.

There is no shortage of industrial relations guidelines for doctors, pharmaceutical representatives, pharmacists and patient groups, covering funding of research posts2 down to specific figures for an acceptable meal price (£75)3.

The British Medical Association's guidance for students in particular instructs only that they should not accept meals or gifts, and should avoid meeting with pharma reps unaccompanied. Following the acknowledgement that 'as a doctor, you will work side-by-side with members of the pharmaceutical industry', students are directed to the Royal College of Physicians' Seven Principles of Public Life applied to doctors.

These are useful empirical moral standards to uphold, but young doctors might need more practicalities to fit into the working relationship between the NHS and industry.

In terms of day-to-day prescribing specifically, it's crystal clear how students should behave. Choice of drug should be based on systematic review of evidence, and since most doctors don't have time to do this for everything they prescribe, we rely on NICE to review the evidence and present clear guidance wherever possible.

Prescribing should be non-proprietary (using the generic drug name, not a brand) in most circumstances, with common exceptions being insulins and Parkinson's medications4. Individual trusts will make decisions about which drugs they recommend locally and which they stock, so pharmacists can be a useful resource on any queries.

Choice of drug should be based on systematic review of evidence.

With ethical and legal advice pointing students away from the pharmaceutical industry, it's natural to feel wary of any drug companies, forgoing conferences and research opportunities for fear of being incriminated by a conflict of interest.

But the NHS and pharmaceutical industries are symbiotic. The way to a prescriber's pad should be through rigorous research, not their belly, and so it's essential that doctors work with industry to carry out well-designed, thorough trials and publish their findings.

Goldacre's Bad Pharma covers issues in research too, and these issues are not going to solve themselves. Medical students can become key players by critically appraising research early in their careers, and becoming evidence-based practitioners when the time comes.

When it comes to industry interaction, the guiding principles for students must be honesty and integrity. It can be difficult to navigate the empirical advice given to students and junior doctors, especially where lack of direction can result in ambiguity.

Educate yourself on the issues at hand and grow confident in finding reliable sources of prescribing information. The pharmaceutical industry is a necessary cog in the machine of healthcare, so while it is wise to avoid the lure of a free lunch, closing yourself off to industry entirely may cause you to miss the opportunity to influence the ever-changing landscape of medicine.

The views expressed in this article are those of the member concerned, and do not necessarily reflect the views and policy of the MDU.

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1. Goldacre, Ben. Bad Pharma. London: Fourth Estate, 2012. ISBN 978-0-00-749808-6.

2. Medicines and Healthcare products Regulatory Agency. Chapter 6: Advertising to persons qualified to prescribe or supply medicine. The Blue Guide 3rd edition. 2014.

3. Prescription Medicines Code of Practice Authority (Association of the British Pharmaceutical Industry). Clauses 18-22. Code of Practice for the Pharmaceutical Industry. s.l. :PMCPA/ABPI, 2016.

4. British Medical Association/Royal Pharmaceutical Society. British National Formulary. 2013.

This article was correct at publication on 21/09/2017. It is intended as general guidance for members only. If you are a member and need specific advice relating to your own circumstances, please contact one of our advisers.

Jessica Leighton

Jessica Leighton is a fourth year medical student at Newcastle University. She hopes to pursue a career in clinical research.

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