Simcor can be a relatively expensive medication for some people. Therefore, you might wonder if you could take generic simvastatin and an inexpensive non-prescription niacin product for the same effects. Currently, there are no niacin products (prescription or non-prescription) that are equivalent to Niaspan (the extended-release niacin in Simcor). The slow-release non-prescription products (such as Slo-Niacin®) are generally considered to be less safe than Niaspan, and the immediate-release products can be very difficult to take (due to the extreme flushing).
In some situations (and only with the approval and supervision of your healthcare provider), you might be able to safely and effectively use generic simvastatin plus a non-prescription form of niacin. However, this cannot be considered to be a completely equivalent alternative to Simcor.