METHODS	Assuming phenylephrine 100 microg to be approximately equipotent to ephedrine 8 mg , the groups contained the proportional potency equivalent of 100 % , 75 % , 50 % , 25 % or 0 % of phenylephrine and 0 % , 25 % , 50 % , 75 % or 100 % , respectively , of ephedrine .\