- Current or prior use of the following: 5alpha-reductase inhibitors (finasteride or dutasteride); anti-cholinergics (e.g. oxybutynin, propantheline, tolterodine, solifenacin, darifenacin, mirabegron) alpha-adrenoreceptor blockers (i.e., indoramin, prazosin, terazosin, tamsulosin, alfuzosin, doxazosin and silodosin), herbal products for urinary symptoms; Use of any investigational study drug within 30 days or 5 half-lives of the drug in question, (whichever is longer), preceding the first study visit.