In Vitro Assessment of Antimicrobial Properties of Rifampin-Coated Titan® Coloplast Penile Implants and Comparison with Inhibizone®


Chirpriya Dhabuwala, MD, Urology, Detroit Medical Center, 4160 John R, Suite 1021, Detroit, Michigan 48201, USA. Tel: 313 9669852; Fax: 313 7458222; E-mail:


Introduction.  It is a common practice to soak Titan® Coloplast penile implants in antibiotic solution prior to implantation.

Aim.  The aim of this study is to identify an ideal solution for soaking the Titan® Coloplast penile implants prior to implantation.

Methods.  Titan® strips were soaked in a different combination of antibiotics and the zone of inhibition was studied against Staphylococcus epidermidis and Escherichia coli. This zone of inhibition was compared against zone of inhibition produced by Inhibizone®-coated silicone strips. Zones of inhibitions were also compared for different components of Inhibizone® implant such as cylinder, tubing, connector, rear tip extender, and reservoir, and compared with similar components of Titan® Coloplast penile implants.

Main Outcome Measures.  The zone of inhibition against S. epidermidis and E. coli for Titan strips dipped in Rifampin and Gentamicin was compared against other antibiotics. The clinical significance of dipping Titan®-coated Coloplast implant in Rifampin and Gentamicin solution was determined.

Results.  Rifampin 10 mg/mL + gentamicin 1 mg/mL (R10/G1) and rifampin 1 mg/mL + gentamicin 1 mg/mL (R1/G1) had excellent coverage against S. epidermidis and E. coli. The zone of inhibition (utilizing the Titan® coating) produced by both these solutions exceeds that produced by Inhibizone® by 40% to 56% for S. epidermidis and 33% for E. coli. Components of the American Medical System implant (tubing connectors and rear tip extenders) are not coated with antibiotics and had no zone of inhibition.

Conclusion.  Soaking Titan®-coated Coloplast implants in R10/G1 solution produces a zone of inhibition greater than that produced by Inhibizone®-coated penile implants. The clinical significance of this increased zone of inhibition can only be determined by a separate clinical study. Dhabuwala C. In vitro assessment of antimicrobial properties of rifampin coated Titan®coloplast penile implants and comparison with Inhibizone®. J Sex Med 2010;7:3516–3519.