Lyric discussion by songanalyst 

I was very surprised to read the above theories, because surely it's obvious what this song is about - the "doctor" is selling an aphrodisiac! There are plenty of hints, starting with the title of the song, which has a double meaning. Here are a few more giveaways:

Who puts the doh-re-me in our pockets, keeps the party going on?

They usually rub it in

We was going through the motions ‘til the doctor came along

These days miracles don’t come falling from the sky ("these days" meaning "now that we've reached a certain age")

He says the French for your lovesick blues, la maladie d’amour

He gets the chumps all laughing

Now we’re going to West Helena to gamble, drink and whore

Let’s you and me all make whoopee

Here’s to all the gals you ever want

I accept that some of these are rather indirect, but in their totality, they add up to the only explanation.

Either that or else I have a one-track mind.

I'd say you're pretty one-tracked - but interesting perspective.

It's not (just) an aphrodisiac, but an all-round cure for all maladies.

The "doh-re-me" is slang for money (doug). Rubbing it in need'nt be rubbing it on the you-know-what, but rubbing it on any affected area, like an arthritic knee, psoriasis-stricken skin or bald head.

@songanalyst I think you nailed it :)

@songanalyst

An error occured.