The Commissioner of Social Services shall verify the propriety and reasonableness of payments to providers for drugs provided to Medicaid recipients through field audit examinations and other reasonable means to the extent possible within available appropriations. To the extent permitted by federal law, the commissioner shall require prior authorization for coverage of drugs for the treatment of erectile dysfunction. To the extent permitted by federal law, the commissioner may limit or exclude coverage for drugs for the treatment of erectile dysfunction for persons who have been convicted of a sexual offense who are required to register with the Commissioner of Emergency Services and Public Protection pursuant to chapter 969. The commissioner shall document financial and utilization statistics as to drugs provided to Medicaid recipients by therapeutic category and shall outline problems encountered in the administration of prescription drug utilization in the Medicaid program, suggested solutions and any recommendations for improvement.