Some of the instructions included in a pamphlet given to Massey High School students.

An Auckland school has defended giving its students a pamphlet with instructions on how to use methamphetamine.

Massey High School runs a Level 3 health course for Year 13 students that requires them to "analyse a health issue", which in this case is meth use by 15- to 24-year-olds.

On Tuesday students were given a pamphlet published by drugfree.org, which included a guideline about how best to use the Class A drug. It told them to keep less than five grams for personal use to avoid being prosecuted, and advised them that swallowing meth is safer than injecting it.

The pamphlet also provided tips about eating regularly and keeping hydrated while under the influence of meth.

A woman whose daughter was given the pamphlet posted pages from it on Facebook, which attracted outrage from others in the school community.