Exhibit 99

Form 4 Joint Filer Information

Name:	Mark Lappe
Address:	11622 El Camino Real, Suite 100
	San Diego, CA 92130
Designated Filer:	Efficacy Capital Ltd.
Issuer & Ticker Symbol:	Repros Therapeutics Inc. (RPRX)
Date of Event Requiring Statement:	12/20/2007
Signature	/s/ Mark Lappe
Name:	Jon Faiz Kayyem
Address:	11622 El Camino Real, Suite 100
	San Diego, CA 92130
Designated Filer:	Efficacy Capital Ltd.
Issuer & Ticker Symbol:	Repros Therapeutics Inc. (RPRX)
Date of Event Requiring Statement:	12/20/2007
Signature	/s/ Jon Faiz Kayyem

Name:	Efficacy Capital Ltd.
Address:	11622 El Camino Real, Suite 100
	San Diego, CA 92130
Designated Filer:	Efficacy Capital Ltd.
Issuer & Ticker Symbol:	Repros Therapeutics Inc. (RPRX)
Date of Event Requiring Statement:	12/20/2007
Signature	Efficacy Capital Ltd.
	By:		/s/ Mark Lappe
	Managing Partner
Name:	Efficacy Biotech Fund L.P.
Address:	11622 El Camino Real, Suite 100
	San Diego, CA 92130
Designated Filer:	Efficacy Capital Ltd.
Issuer & Ticker Symbol:	Repros Therapeutics Inc. (RPRX)
Date of Event Requiring Statement:	12/20/2007
Signature	Efficacy Capital Ltd., Investment Manager
	By:	/s/ Mark Lappe
	Managing Partner

2

Name:	Efficacy Biotech Fund Limited
Address:	11622 El Camino Real, Suite 100
	San Diego, CA 92130
Designated Filer:	Efficacy Capital Ltd.
Issuer & Ticker Symbol:	Repros Therapeutics Inc. (RPRX)
Date of Event Requiring Statement:	12/20/2007
Signature	Efficacy Capital Ltd., Investment Manager
	By:	/s/ Mark Lappe
	Managing Partner

3

Name:	Efficacy Biotech Master Fund Ltd.
Address:	11622 El Camino Real, Suite 100
	San Diego, CA 92130
Designated Filer:	Efficacy Capital Ltd.
Issuer & Ticker Symbol:	Repros Therapeutics Inc. (RPRX)
Date of Event Requiring Statement:	12/20/2007
Signature	Efficacy Capital Ltd., Investment Manager
	By:	/s/ Mark Lappe
	Managing Partner

4