Those taking Macrodantin after intercourse.How many pills and for how many days?

Are (or were) you given these for a current infection or for prevention of bladder infections. The dose and frequency may be different.

These are the recommended dose details for Macrodantin (nitrofurantoin).

* For oral dosage forms (capsules, suspension, and tablets):

o For prevention of urinary tract infections:
+ Adults and teenagers—50 to 100 milligrams (mg) at bedtime.
+ Children and infants 1 month of age and older—Dose is based on body weight and must be determined by your doctor.
+ Infants younger than 1 month of age—Use is not recommended.

o For treatment of urinary tract infections:
+ Adults and teenagers—50 to 100 milligrams (mg) every six hours.
+ Children and infants 1 month of age and older—Dose is based on body weight and must be determined by your doctor.
+ Infants younger than 1 month of age—Use is not recommended.

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* For oral dosage form (extended-release capsules):

o For treatment of urinary tract infections:
+ Adults, teenagers, and children 12 years of age and older—100 milligrams (mg) every twelve hours for seven days.
+ Children younger than 12 years of age—Use and dose must be determined by your doctor.

http://www.drugs.com/cons/furadantin.html