Editing Codeine/paracetamol (section)

==Side effects==
The most common side effects include constipation, nausea and drowsiness.<ref name="NHS">{{cite web |url=https://www.nhs.uk/medicines/co-codamol-adults/ |title=Co-codamol for adults: painkiller containing paracetamol and codeine |newspaper=National Health Service |date=19 December 2018 |access-date=16 April 2021 |archive-date=14 January 2022 |archive-url=https://web.archive.org/web/20220114124849/https://www.nhs.uk/medicines/co-codamol-adults/ |url-status=live }}</ref>
Others include [[hemoptysis|coughing up blood from the lungs]], [[Rash|skin rashes]], [[dizziness]], [[sedation]], shortness of breath, [[hypersensitivity]] reaction, [[fainting]] (syncope or near syncope), [[confusion]], loss of [[short-term memory]], changes in [[blood]], allergic reactions, [[euphoria]], [[dysphoria]], abdominal pain, itchiness, easy [[bruise|bruising]], bleeding [[Gingiva|gums]], [[vivid dream]]s, dry mouth and addiction.<ref>{{cite book | vauthors = Nielsen S, Van Hout MC | title = Over-the-Counter Codeine-from Therapeutic Use to Dependence, and the Grey Areas in Between | series = Current Topics in Behavioral Neurosciences| volume = 34 | pages = 59–75 | date = 2017 | pmid = 26768736 | doi = 10.1007/7854_2015_422 | isbn = 978-3-319-60014-7 | hdl = 1959.4/unsworks_62273 | hdl-access = free }}</ref>

Genetic differences between people cause differing rates of metabolism of codeine to [[morphine]]. In about 5 percent of people this may happen particularly fast, causing morphine to be passed through breast milk in amounts that may cause fatal [[respiratory depression]] in a breastfed baby.<ref>{{cite news|title=Codeine Use While Breastfeeding May Be Dangerous|url=https://www.ctvnews.ca/codeine-use-while-breastfeeding-may-be-dangerous-1.317673|work=CTV News|date=20 August 2008|access-date=13 August 2020|archive-date=1 September 2008|archive-url=https://web.archive.org/web/20080901210431/https://www.ctv.ca/servlet/ArticleNews/story/CTVNews/20080820/tylenol_3_breastfeeding_080820/20080820|url-status=live}}</ref>