Is it OK to break the prozac capsule up and take half the powder

You should never break any kind of capsule in half. Only solid tablets.
Did u ever wonder why two capsules of the same medicine r the same size & weight but have different strengths measured in mgs. ?
That is because over 90 percent of the capsule is made up of glucose & other fillers. Only a pinch of the powder contains the actual medicine.
So in other words that pinch of medicine could end up being all in one side of the capsule. This would give u a double dose one day & nothing the next.

Never break a powder capsule, as yes they are slow release, and you can not be sure of getting the correct dose. If you feel that you only want to take 10mg a day, go to your doctor and get a new prescription. The only medication you can take half off is those that come in solid form and are scored.

You should never break open a slow release capsule. It is there so that the medication wo not rush into ur system too fast. With some medications, breaking open the capsule can result in a dangerous overdose. Even if you're taking a low enough dose that you're not in danger of an overdose, the medication wo not work properly if it is all released into ur system at once. You should follow ur doctor is advice & take one capsule every other day, or else get a new prescription for 10 mg a day.

You need to call your doctor, as you cannot get the correct dose you need by guessing. And it is time released for a reason, not to break the seal on the capsule. You need a new
prescription for 10 mg. Call him first thing in the morning and talk to him before you hurt yourself.