An issue of the Trinity Student Medical Journal has been withdrawn after it published a step-by-step guide on how to make the so-called head shop drug mephedrone from everyday products.

The Trinity News reports the instructions were part of an essay titled ‘Inspiration from Breaking Bad: The Synthesis of Mephedrone from Legally-Acquired Domestic Substances’.

This was written by two scholars of the School of Medicine under the supervision of a toxicologist in the Discipline of Pharmacology and Therapeutics at St James’s Hospital.

The issue was launched last Thursday but editors were ordered on Friday to withdraw it.

In a statement, Trinity College said the TSMJ is a student-led journal, edited and managed by Trinity medical students.

It said no academic member of staff is involved in the editorial decisions of the TSMJ.

The college said: “The TSMJ editorial board has made clear that the article was intended to highlight the important public health issue of illegal drug manufacture by dangerous methods that may generate potentially lethal and uncharacterised products.

"In this case the article suggested that the final product could be mephedrone; an illegal substance.

“However, concerned by its contents, the School of Medicine on sight of the published article requested that the TSMJ editorial committee withdraw the journal from circulation due to a combination of significant scientific inaccuracies.”

The college said the main issues were that the conclusion that the final product was mephedrone was incorrect and that the experimental methods were inaccurately reported.