Are there any studies that show that this is a viable therapy?
There is more than enough evidence that it works and it has been around long enough to know that it is safe. From what I know is that originally was developed against river blindness and more recently was discovered that apparently it is also effective against this crazy virus. But like many other drugs which may be useful against more than one disease, unless it has been approved by the FDA for a particular purpose even so it may be safe, frowns upon its use. Not to mention that money speaks louder than words.