Trimethoprim can make you sunburn more easily. Wear protective clothing and use sunscreen (SPF 30 or higher) when you are outdoors.
Before you take trimethoprim tablets or suspension, tell your doctor:
- If you suffer from kidney problems.
- If you have a deficiency (are low) in folic acid.
- If you are at greater risk of high levels of potassium in your blood (hyperkalemia), e.g. the elderly or those on higher doses.
- If you are also taking repaglinide (medicine for treating diabetes).
Do not take trimethoprim if you are pregnant or breast-feeding. You may be required to undergo regular blood tests if you need long-term treatment or are prone to anaemia.
Consult your doctor immediately if you experience any of these adverse effects.
- fever, chills, body aches, flu symptoms, sores in your mouth and throat.
- pale skin, easy bruising, unusual bleeding (nose, mouth, vagina, or rectum), purple/red pinpoint spots under your skin.
- signs of high pottasium levels (slow heart rate, weak pulse, muscle weakness, tingly feeling).
- severe headache with muscle cramps, confusion, weakness, loss of coordination, feeling unsteady, and weak or shallow breathing.