A pill cutter is the best way to ensure accurate sizing of each half or quarter of your finasteride. We think this is the best available and import it from the USA ourselves.
In order to protect against the damaging effects of humidity finasteride is coated in film. This makes the tablets hard to halve or quarter. A good pill cutter is the only way tone accurate.
You can pick a pill cutter up at the Two Dollar Shop but you tend to get what you pay for. Often the cheap ones leave you with a pile of dust. The Apex Pill Cutter is imported from the USA and will accurately cut your pills for some time.