My eyelashes are white. Is there any medicine to make them black again?

Thank you for your question. Tinting your eyelashes may provide the desired look. Consider tinting as an option. Best, 

I would recommend you see a professional for lash tinting. While Latisse can make the lashes longer, thicker, and darker, there does need to be coloration there for them to darken. White eyelashes can respond with length, but for color, you should have them tinted. "This answer has been solicited without seeing this patient and
cannot be held as true medical advice, but only opinion. Seek in-person
treatment with a trained medical professional for appropriate care."