I consider this safe for any woman of any age dealing with chronic cystitis — even women who are pregnant, lactating, or using chemotherapy or other heavy drugs that suppress the immune system (and make cystitis more likely), so long as the dose is not exceeded.

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½ ounce/14g yarrow flowering herb (Achillea millefolium)
½ ounce/14g marshmallow root (Althea officinalis)
½ ounce/14g uva ursi leaves (Arctostaphylos uva-ursi )
½ ounce/14g echinacea root (Ech. angustifolia ONLY)

Soak the dried herbs in two quarts/liters of cold water overnight.
Bring water and herbs to a boil, remove from heat, cover, and steep for four or more hours. 
Drink by the sip, about a cup an hour until symptoms abate. 
Continue drinking 2–4 cups a day for at least a week. 
For prevention, drink 1–2 quarts a week.

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Excerpt from 
Down There: Sexual and Reproductive Health the Wise Woman Way ..

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