Get emergency medical help if you have signs of an allergic reaction: hives; difficult breathing; swelling of your face, lips, tongue, or throat.
Call your doctor right away if you have:
a light-headed feeling, like you might pass out;
ringing in your ears, sudden hearing loss;
kidney problems--little or no urination, painful or difficult urination, swelling in your feet or ankles, feeling tired or short of breath;
low magnesium level--dizziness, irregular heartbeats, feeling jittery, muscle cramps, muscle spasms, cough or choking feeling;
low potassium level--leg cramps, constipation, irregular heartbeats, fluttering in your chest, increased thirst or urination, numbness or tingling, muscle weakness or limp feeling; or
low sodium level--headache, confusion, slurred speech, severe weakness, vomiting, loss of coordination, feeling unsteady.
Common side effects may include:
increased urination; or
headache.
This is not a complete list of side effects and others may occur. Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.
 Torsemide side effects (more detail)
