title: Effects of initiation day of clomiphene citrate on the endometrium of women with regular menstrual cycles.
abstract: OBJECTIVE
  To investigate the effects of initiation time of clomiphene citrate (CC) on the endometrium of women with regular menstrual cycles.
  
  
  METHODS
  Randomized, double-blind, cross-over study.
  
  
  METHODS
  Department of Obstetrics and Gynecology, Faculty of Medicine, Chulalongkorn University, Bangkok, Thailand.
  
  
  METHODS
  Thirty-three healthy female volunteers with regular menstrual cycles.
  
  
  METHODS
  The volunteers were randomized to receive either 100 mg of CC on days 1-5 and placebo on days 5-9 (study group) or placebo on days 1-5 and CC on days 5-9 (control group). After a wash-out period of 1 month of CC treatment, the medication was switched in each group. Ultrasonography was performed daily after day 10 of the cycle to detect ovulation. Ultrasonography for endometrial appearance and thickness, endometrial sampling, and blood samples obtained for determination of E(2) and P levels were performed 7 days after ovulation in both groups.
  
  
  METHODS
  Morphometric analysis, histologic dating, and ultrasonographic appearance and thickness of the endometrium.
  
  
  RESULTS
  Morphometric parameters, histologic dating, and ultrasonographic appearance and thickness of the endometrium were similar in both groups.
  
  
  CONCLUSIONS
  Starting CC on either day 1 or day 5 of the menstrual cycle did not have any differential effects on the endometrium of women with regular menstrual cycles, particularly regarding the morphometric analysis, histologic dating, or ultrasonographic appearance.
authors.affiliation: Department of Obstetrics and Gynecology, Reproductive Medicine Unit, Faculty of Medicine, Chulalongkorn University, Bankok, Thailand. kanoksorn@hotmail.com
authors.forename: Anusorn
authors.initials: A
authors.lastname: Triwitayakorn
authors.forename: Somchai
authors.initials: S
authors.lastname: Suwajanakorn
authors.forename: Surang
authors.initials: S
authors.lastname: Triratanachat
authors.forename: Pichet
authors.initials: P
authors.lastname: Sampatanukul
authors.forename: Kamthorn
authors.initials: K
authors.lastname: Pruksananonda
authors.forename: Wisan
authors.initials: W
authors.lastname: Sereepapong
mesh_terms: D000328:Adult; D002996:Clomiphene / Q000008:administration & dosage* / Q000494:pharmacology; D018592:Cross-Over Studies; D004311:Double-Blind Method; D004334:Drug Administration Schedule; D004717:Endometrium / Q000033:anatomy & histology / Q000000981:diagnostic imaging / Q000187:drug effects*; D004965:Estrogen Antagonists / Q000008:administration & dosage* / Q000494:pharmacology; D005260:Female; D006801:Humans; D008597:Menstrual Cycle / Q000502:physiology*; D012016:Reference Values; D014463:Ultrasonography
chemical_list: D004965:Estrogen Antagonists; D002996:Clomiphene