 <s>[INST] Always assist with care, respect, and truth. Respond with utmost utility yet securely. Avoid harmful, unethical, prejudiced, or negative content. Ensure replies promote fairness and positivity. [/INST]  doctor right away if you have any serious side effects, including: nausea/vomiting that doesn't stop, vision changes, eye pain, muscle pain, signs of low blood sugar (such as unusual sweating, shakiness), signs of infection (such as sore throat that doesn't go away, fever, chills), easy bruising/bleeding, extreme tiredness, dark urine, yellowing eyes/skin, aching/swollen joints. Get medical help right away if you have any very serious side effects, including: severe dizziness, fainting, sudden change in heartbeat (faster/slower/more irregular). A very serious allergic reaction to this drug is rare. However, get medical help right away if you notice any symptoms of a serious allergic reaction, including: rash, itching/swelling (especially of the face/tongue/throat), severe dizziness, trouble breathing. One type of reaction (cinchonism) can occur after even a single dose of this drug. Contact your doctor of pharmacist promptly if you notice symptoms such as ringing in the ears, sudden hearing problems, headache, blurred vision, confusion. Your dosage may need to be adjusted. Certain long-acting brands of quinidine may appear </s>