Anybody else want to join him?

Hi its used when you are sick from the coronavirus but read this

Precautions and Contraindications:
Arrhythmias, chronic heart disease, risk of prolonged QT interval, or congenital or
documented shifted QT interval
Severe haematological disorders.
 Psoriasis, epilepsy
Side effects
General (usually benign and reversible): headache, dizziness, loss of appetite, nausea,
vomiting, abdominal pain, diarrhea, tinnitus, irritability ...
 Skin abnormalities: itching, urticaria, rash ...
Eye disorders (sometimes irreversible): cornea clouding, retinopathy, maculopathy ...
Cardiac: cardiomyopathy, arrhythmias ...
Hematologic: bone marrow depression
Drug interactions
Tamoxifen, digoxin
Medicines for which torsade de pointes have been reported, or medicines that prolong it
Cause QT interval.

Sources :
- [Expert consensus on chloroquine phosphate for the treatment of novel coronavirus pneumonia]: