Med labels statement
 

On all bottle it usually say do not use after 7 days , but then your dr says its ok to use daily..... who do you believe????

Doctors have the right to supercede OTC directions on some things medications.

Many OTC products may have been RX at one time, and only make it OTC with various warnings and restrictions. This is so people don't diagnose themselves, and use the product instead of consulting a doctor when prolonged use is needed.