Unlikely: Codeine is a pain medication and this is an unlikely side effect. The sores are probably independent of the medication.
Answered 4/1/2019
5.5k views
Unlikely: It is unusual for Codeine to cause mouth sores. The sores are probably caused by something else. Patients often get ulcers called aphthous ulcers which are usually caused by stress.
Answered 6/24/2014
5.5k views
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