How long does it take for the white levlen (ethinyl estradiol and levonorgestrel) ED tablets to take effect?

Up to 14 days. Check out http://www.Mydr.Com.Au/cmis/pdfs/cmi8018.Pdf and http://www.Medsafe.Govt.Nz/consumers/cmi/l/levlen (ethinyl estradiol and levonorgestrel).Pdf for info on levlen (ethinyl estradiol and levonorgestrel) ed. How quickly it takes effect depends upon what you were doing/taking prior. Whether to use add'l contraception, eg condom, depends upon what you read (see above) and your doctor. Best to ask him/her.