Get emergency medical help if you have signs of an allergic reaction: hives; difficult breathing; swelling of your face, lips, tongue, or throat.
Also call your doctor at once if you have:
a light-headed feeling, like you might pass out;
little or no urination;
swelling in your feet or ankles, rapid weight gain;
unusual pain or tightness in your lower body;
a skin ulcer; or
high potassium level--nausea, weakness, tingly feeling, chest pain, irregular heartbeats, loss of movement.
Common side effects may include:
stuffy nose, sinus pain;
back pain; or
diarrhea.
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.
 Telmisartan side effects (more detail)
