I was told by a very good compound pharmacey 7.5 500,or 7.5 750 work much better for many people.I took the advice and i agree,i had much more relief from my pain.I also have taken every pain medication under the sun and the mallies are the worst to me.I have went as far to wait 5 days untill the watson brand came in stock because every one requests the watson and stay away from the malliies.I told the pharmacey that mallies are very weak ,he said he has heard that the meds are weak from hundreds of people .the pharmacist said they have a contract and havr to carry the mallie brand ,has anyone ever heard of this. What a joke.