Dihydrocodeine is a medication used to treat pain, fever, and swelling. It is composed of a mixture of opioid pain relievers, aspirin, and caffeine. While the opioid pain relievers interact with the brain, the aspirin decreases fever and swelling and caffeine increases the effectiveness of the aspirin. 

Some patients may notice common side effects after taking dihydrocodeine. Common dihydrocodeine side effects include nausea, vomiting, upset stomach, tremors, constipation, dry mouth, lightheadedness, dizziness, and drowsiness. If these side effects get worse or persist over time, be sure to let your doctor know. 

Serious dihydrocodeine side Serious side effects are uncommon after taking dihydrocodeine, but they are still important to know in case they need to be identified in an emergency. Serious dihydrocodeine side effects include agitation, hallucinations, mood changes, irregular heartbeat, increased thirst or urination, ringing in the ears, easy bruising or bleeding, signs of infection, persistent sore throat, fever, heartburn, discomfort when swallowing, dark urine, yellowing of the skin or eyes, signs of kidney problems, difficulty urinating, loss of appetite, unusual tiredness and weight loss. Tell your doctor or pharmacist as soon as possible if these serious side effects become noticeable. 

Seek medical attention as soon as possible if you start to notice the following while you are taking dihydrocodeine: fainting, seizure, black stool, severe stomach or abdominal pain, vomit that resembles coffee grounds, slurred speech, and weakness on one side of the body.