Considerations before hydroxychloroquine use
| Measure glucose-6 phosphate dehydrogenase if indicated |
| Take ocular history and order baseline ophthalmologic evaluation |
| Screen for digoxin use |
| Screen for history of cardiomyopathy or severe heart failure |
| Counsel patient on risks of use, including permanent loss of vision and recommended frequency of screening retinal examination |
| Counsel on risks of skin rashes, gastrointestinal upset, increased hair and skin pigmentation |
| Obtain baseline laboratory testing |