Codalgin fights pain with the combination of acetaminophen and codeine phosphate. It may be substituted in patients that can't take aspirin due to conditions such as stomach ulcers. Acetaminophen works as both an analgesic (pain blocker) and an antipyretic (fever reducer). Codeine phosphate acts as an opioid analgesic to block pain in the brain. Although it is generally thought to be a safe pain reliever, some side effects exist.
Habit Forming
The codeine in Codalgin derives from morphine, a narcotic that works to dull the pain centers in the brain and is known to be addictive. Codeine isn't as strongly habit-forming as morphine, according to Kiwi Drug of New Zealand, but those with a history of drug addiction or a known susceptibility to opioids should steer clear of the analgesic. Common signs of addiction include sleeplessness and irritability.
Birth Defects
One possible side effect from the codeine in Codalgin is malformation of newborns. Because of possible birth defects, Kiwi Drug warns that pregnant mothers should not take Codalgin.
Drowsiness
Codalgin may make you feel sleepy. Drowsiness, dizziness and lethargy are all listed as possible side effects by My Doctor. These and other side effects may be especially problematic in elderly patients, who may have other underlying medical conditions.
Gastrointestinal Problems
Codalgin may trigger gastrointestinal problems. Nausea, vomiting and constipation are all possible side effects from the drug, according to Preop.com. The site warns not to take more than the recommended dosage because gastrointestinal problems are more likely with higher doses. Don't take the medication any longer than necessary, because it tends to lose its pain-killing properties over time.
Allergic Reaction
Codalgin may spur an allergic reaction, especially with those who have a sensitivity to opioids. My Doctor warns if you develop a rash, facial swelling, trouble breathing or become severely nauseated, you should contact your physician. Other serious side effects, though rare, include frequent infections, fever, mouth ulcers, bleeding and difficulty urinating.
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