When it comes to speed and efficiency, I think it must be injections because Injected medications can directly go into our bloodstream. This direct supply ensures that the medication's potency is unleashed promptly, providing a swift and effective response to pain.

On the other hand, Oral medications takes time to go through our body and digestive system to kick in. So there's a question about the pain relief speed rather than the efficiency.

I don’t even mind the delay In efficiency as long as I don’t see the needles. Best regards and success