Short-Term Codeine Side Effects
There are several side effects of codeine that may develop after a single dose of codeine. Codeine can cause physical and behavioral side effects as it slows nerve signals in the brain.
Physical Side Effects
The short-term physical side effects of codeine occur because of the changes in the neurological system that codeine causes. These include:
- Drowsiness
- Itching
- Constricted pupils
- Nausea
- Vomiting
- Constipation
- Decreased breathing
Short-term physical side effects can be dangerous or deadly if too much codeine is used. Physical symptoms of an overdose include having very decreased or absent breathing, being very difficult or impossible to wake and death.
Behavioral Side Effects
Short-term behavioral side effects are related to how codeine suppresses signals in the brain and are caused by chemical changes, as opposed to psychological changes. Short-term behavioral side effects of codeine include :
- Slurred speech
- Decreased responsiveness
- Sleepiness during activities or conversations
- Confusion
These behavioral symptoms are more common with those who have taken a large dose of codeine or are taking other medications or alcohol with codeine.