GC: n

S: Mednet – http://www.medicinenet.com/script/main/art.asp?articlekey=5489 (last access: 13 September 2015); NHS – http://www.nhs.uk/chq/pages/997.aspx?categoryid=73&subcategoryid=108 (last access: 13 September 2015).

N: 1. Also side-effect, 1884, from side (adj.) + effect (n.). Medical use, with reference to drugs, is recorded from 1939.
2. A secondary and usually adverse effect (as of a drug) —called also side reaction.
First Known Use of SIDE EFFECT: 1884.
3. Usual in plural.

S: 1. OED – http://www.etymonline.com/index.php?term=side+effect (last access: 13 September 2015). 2. MW – http://www.merriam-webster.com/dictionary/side%20effect (last access: 13 September 2015). 3. Mednet – http://www.medicinenet.com/script/main/art.asp?articlekey=5489 (last access: 13 September 2015); NHS – http://www.nhs.uk/chq/pages/997.aspx?categoryid=73&subcategoryid=108 (last access: 13 September 2015); FCB.

SYN: ill effect(s)

S: GB – http://books.google.co.uk/books/about/Ill_Effects.html?id=l_wD_mxdyEoC (last access: 2 September 2014); NAVARRO p. 486.

CR: clinical pharmacology, disease, health care, patient, sick person.