A Muscatine doctor who was accused of giving prescription medication to female patients in exchange for sexual favors has agreed not to practice medicine, according to the Iowa Board of Medicine, Des Moines.

Dr. David Gierlus faces three counts of abuse of controlled substances, filed Aug. 31 in U.S. District Court, Davenport. He formerly had a family practice at Trinity Muscatine Clinic, 1518 Mulberry Ave., Muscatine.

On Sept. 21, he voluntarily agreed not to engage in any aspect of the practice of medicine until the board approves his return to the profession. He first got his Iowa medical license on July 15, 1987, and it will next expire on March 1, 2013.

On the three charges he faces, the government claims Gierlus dispensed powerful controlled substances to more than 30 women on multiple occasions, often in exchange for sexual favors.

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An investigation by the Iowa Board of Medicine is pending.

If Gierlus fails to comply with the current order, the board may suspend or revoke his medical license or impose other discipline.