Analgesic Puns

I think I "invented" this joke when I was around 15, but I'm sure others have as well since it's not too subtle. The key, though, was that I waited for just the right moment to use it for the first time.

I had an ear infection, so I went to the doctor, who took a look and quickly diagnosed it and wrote a prescription and handed it to me.

> Doctor: It's just an ear infection, so 4 drops of this daily should clear it right up.

> Me: [Reading the prescription, and seeing the name of the antibiotic, but I may be wrong about the name, so if anyone knows the right name, please reply.] [Completely seriously.] Oraline? So, I put the drops in my mouth?

> Doctor: [Quizzically.] No, no, no, you put it in your ear!

> Me: Oh, I read the name, and "Oraline" sounds like something you'd take orally.

> Doctor: Nope, in the ear.

> Me: [Remembering my dad joke.] It's a good thing that you didn't prescribe me analgesics.

The doctor had no reaction, just said their deadpan goodbye and left. I've wondered if they didn't get it, didn't think it was funny, or had heard it hundreds of times before.