do we have standardised drugs in Ayurveda?

There are pretty standard herbal FORMULAS and standard PRACTICES but because herbs aren't produced pharmaceutically I'm not sure how you compare herbs from different sources.
Sources for herbs: Banyan Botanicals, Maharishi Ayurved. You can find either on line and I believe both are good quality. You could contact either of these and ask about how they insure the quality of their products.
I can say that I'm very sensitive to chemicals, food allergies, etc. and I've never had any reactions to products from the above mentioned vendors.

It is un-reasonable to expect standardised drugs from natural source. Human being is also a creation of nature. Are all the humans standard? Consider their immunity, their physical measurements, the appetite, the nature, the behaviour, skin colour, hair colour, physiological variants.........
Mango from Ratnagiri, and mango from Devgad and all other parts of the world are different. The properties therefore are relatively same of specfic herbs but it is impossible to expect standardization in this area.