What side effects may I notice from receiving Sulfamethoxazole, Trimethoprim?

Side effects that you should report to your doctor or health care professional as soon as possible:

-allergic reactions (skin rash, itching or hives; swelling of the face, lips, or tongue)
-bloody or watery diarrhea
-cough
-heartbeat rhythm changes (trouble breathing; chest pain; dizziness; fast, irregular heartbeat; feeling faint or lightheaded, falls,)
-fever
-high potassium levels (chest pain; fast, irregular heartbeat; muscle weakness)
-kidney injury (trouble passing urine or change in the amount of urine)
-liver injury (dark yellow or brown urine; general ill feeling or flu-like symptoms; loss of appetite, right upper belly pain; unusually weak or tired, yellowing of the eyes or skin)
-low blood pressure (dizziness; feeling faint or lightheaded, falls; unusually weak or tired)
-low blood sugar (feeling anxious; confusion; dizziness; increased hunger; unusually weak or tired; increased sweating; shakiness; cold, clammy skin; irritable; headache; blurred vision; fast heartbeat; loss of consciousness)
-low red blood cell counts (trouble breathing; feeling faint; lightheaded, falls; unusually weak or tired)
-rash, fever, and swollen lymph nodes
-redness, blistering, peeling, or loosening of the skin, including inside the mouth
-trouble breathing
-unusual bruising or bleeding
Side effects that usually do not require medical attention (report to your doctor or health care professional if they continue or are bothersome):

-lack or loss of appetite
-nausea
-vomiting

This list may not describe all possible side effects for Sulfamethoxazole, Trimethoprim. Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.