It's not an obvious R here, but 'na dobrom glasu' means 'a good reputation,' and is also a play on words for this billboard advertising Fitosept, a throat lozenge. 'Dobrom glasu' can also mean 'a good voice,' which is what you will allegedly get back if you suck on Fitosept.
P.S. I don't think you have to balance the lozenge like that.... ;)
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