Yes, you can. They say that generics are the same active ingredients and only the inactive ingredients are different BUT these inactive ingredients can affect the way the active ingredients are absorbed so certain drugs, mainly with hormones and anticonvulsives, it is best to try to stick with one manufacturer all the time but it is hard in some cases because pharmacies buy different generic brands depending on their supplier and prices. This is where it is important to develop a good relationship with your pharmacist and ask that they order your drug from the same manufacturer as much as possible.
Also the generic does not have to have the exact amount of medication and can vary by as much as 25%. Although the brand costs more, I did find a real difference during the year it wasn't available. The doctor must write, "do not substitute" on the prescription. And then check with the pharmacist when you pick it up.
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