EWING, N.J.--(BUSINESS WIRE)--Antares Pharma, Inc. (NYSE Amex: AIS) today announced that the first patient has been dosed in a clinical study evaluating the VIBEX™ MTX product which is being developed for the treatment of rheumatoid arthritis. The clinical study will evaluate several dose strengths of VIBEX MTX delivered with a proprietary autoinjector versus conventional needle and syringe administration by a healthcare professional.