"Many experts have said they believe they are relatively safe, although hydroxychloroquine can cause dangerous heart problems and some specialists recommend electrocardiogram screening tests, especially when used in combination with azithromycin. The Mayo Clinic issued a warning Wednesday that doctors need to determine which patients are at risk of potentially fatal arrhythmia before they prescribe the drugs."

"The drugs also can cause permanent eye damage called retinopathy that can lead to vision loss and blindness."

There isn't anything in the article stating which patients are at risk for retinopathy.

[washingtonpost.com]

The list of medications advised to not use in conjunction with hydroxychloroquine is quite long, as is the list of contra-indicated conditions. The letter from this doctor reads as though he's not doing any screening for these factors or the advised electrocardiograms.

[mayoclinic.org]

That is hope ful. Again it appears there should be no delay in treatment when symptoms appear. I hope cc ing trump and his staff does not cause a delay in vital information or the hoarding of meds by this administration. I really do not like bringing up facts that appear to some to be raining on the parade but damn we have over 3 years of direct evidence that it is all about him, protecting those around him and the very wealthy.