Get emergency medical help if you have any of these signs of an allergic reaction: hives; difficulty breathing; swelling of your face, lips, tongue, or throat.
Call your doctor at once if you have a serious side effect such as:
diarrhea that is watery or bloody;
peeling skin , severe pain, or changes in skin color where the medicine was injected;
dizziness, joint or muscle pain;
fast or pounding heartbeats;
numbness, tingling, pain, swelling, or redness in your arms or legs;
confusion, agitation, depression, unusual thoughts or behavior;
chest pain, problems with vision or speech;
feeling like you might pass out;
fever, chills, dizziness, muscle pain, rapid breathing or heart rate;
uncontrolled muscle movements, problems with balance or walking;
pale skin, easy bruising or bleeding, unusual weakness;
sore throat, flu symptoms;
urinating less than usual or not at all;
rash or itching with swollen glands, joint pain, or general ill feeling; or
slow heart rate, weak pulse, fainting, slow breathing.
Less serious side effects may include:
pain where the injection was given;
vaginal itching or discharge;
white patches in your mouth or throat;
nausea, vomiting;
blurred vision, ringing in your ears;
headache, dizziness; or
mild skin rash,
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.
 Wycillin side effects (more detail)
