Query Lists Repeat Data

Hi, all... welcome back to the new Access World Forums... glad we're still operational, even if some data was lost. It's the minds, anyway, not the data...

I have a query that pulls from 3 transaction tables.

tblTransactions - lists purchaser, amt tendered, other details
tblPurchased_Items - lists products and services paid for
tblTherapy_Treatments - lists treatments paid for

(Note: these are not separate lists of available items. They're two subforms' tables, one that deals with insurance and one that doesn't.)

I can pull this data fine, but in a case where someone had 1 treatment, but purchased 2 products, the query lists the treatment twice. I do have unique IDs for each table's items, but am not sure how to "list" each transaction once, but each thing paid for once, also.

For example:
Joe Blow comes in and has physical therapy and buys 2 books.

My query will show (bogus fields for illustration purposes):
TransactionID Name TherapyID TherapyCost ProductID ProductCost
33 Joe Blow 10 180.00 15 12.00
33 Joe Blow 10 180.00 17 19.00

So, if I total TherapyCost it really gives me twice the correct amount.

Can someone point me to a solution?
Pardon my rank ignorance, yet again.