Voila Castro -- they probably do but you should call first to see if they do, that a a common one
They do have quite a few herbal or blends for bladder issues. Everything I've gone there for, they have had a lot to choose from and I've always left there with what I needed. Staff is knowledgeable and will spend time comparing ingredients and brands to help you choose what's best.
I remember seeing Bladder remedies. Not sure about Cantharis.
Sorry, I don't know if they do!
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