I have hypertension i take enalapril 10mg each day. my doctor prescribed me bactrim 800/160 12hrs for 6 days for urinary infection. i found out that this combination can cause hyperkalemia. i only took one dose. should i worry ?

I think you can keep taking your medications. I've never seen clinically significant hyperkalemia in this particular case. Of course, the underlying medical conditions should be considered; but, if your doctor prescribed you those medications you should be fine.

Bactrim has been known to cause hyperkalemia. This is uncommon. However, the risk may be increased if combined with ACE inhibitor or ARB which have a greater potential to increase serum potassium. Please ask your physician about the need for any special precautions.