What are the possible side effects of Quinidex?

Get emergency medical help if you have any of these signs of an allergic reaction: hives; difficult breathing; swelling of your face, lips, tongue, or throat.

Call your doctor at once if you have a serious side effect such as:
vomiting and diarrhea;
ringing in the ears, hearing loss, severe dizziness;
feeling like you might pass out;
changes in vision, pain behind your eyes, increased sensitivity of your eyes to light;
white patches on your eyes;
cloudiness in the pupils or iris of your eyes;
a new or a worsening irregular heartbeat pattern;
pale or yellowed skin, dark colored urine, fever, confusion or weakness;
nausea, stomach pain, low fever, loss of appetite, clay-colored stools;
seizure (convulsions);
easy bruising, unusual bleeding (nose, mouth, vagina, or rectum), purple or red pinpoint spots under your skin; or
bronchospasm (wheezing, chest tightness, trouble breathing).

Less serious side effects may include:
mild nausea, vomiting, or diarrhea;
heartburn;
depressed mood;
muscle or joint pain;
headache, dizziness;
mild skin rash;
skin dryness, peeling, or flaking; or
flushing (warmth, redness, or tingly feeling).

This is not a complete list of side effects and others may occur.