​The acting ingredient in this pain treatment is codeine phosphate. It works by releasing chemicals in the brain that mimic the action of endorphins. Once active, these chemicals help to dull the brain’s perception of pain signals by combining with opioid receptors (hence the name, opioid analgesic). Although it is effective in reducing pain, it will not remedy the condition or injury causing discomfort.
As it is stronger than many other forms of pain relief, you will always need prior consultation with a doctor in order to buy Codeine online from a US pharmacist. This is to ensure that the medication is safe for you to take, and that you are not at increased risk of suffering from severe side effects.

Known possible side effects include blood problems, nausea, vomiting and addiction.
A doctor may not issue this treatment to persons who are pregnant, breastfeeding, allergic to any ingredients, or who have a history of liver or kidney disease. Those who have been alcohol- or drug-dependent in the past may also be unsuitable.
The information provided here is not extensive. For a full list of restrictions and possible side effects, consult the safety information