It was mentioned as a possibility very early on - so could have been trialled in China.
If any use for prevention our lot will come up with the "world demand so can't get any".
The drug makers provide better info
Common side effects (may affect less than 1 in 10 people)
You have any eye problems. This includes changes in the colour of your eye and problems with your eyesight such as blurring, sensitivity to light or the way you see colour.
Uncommon side effects (may affect less than 1 in 100 people)
You have any muscle weakness, cramps, stiffness or spasms or changes in sensation such as tingling. If you take this medicine for a long time, your doctor will occasionally check your muscles and tendons to make sure they are working properly.
Very common side effects (may affect more than 1 in 10 people)
Stomach pain
Feeling sick
Common side effects (may affect less than 1 in 10 people)
Skin rashes, itching
Being sick, diarrhoea
Loss of appetite (anorexia)
Headache
Changes in mood with uncontrollable laughing or crying
Uncommon side effects (may affect less than 1 in 100 people)
Changes in the colour of your skin or the inside of your nose or mouth
Hair loss or loss of hair colour
Feeling nervous
Ringing in the ear (tinnitus)
Balance problems (vertigo) or feeling dizzy
Liver problems shown by blood tests
That for a drug that has never been dished out like smarteys.
It's mmm pretty impressive in a nasty way for one of those.