Response to dosage is highly individual. In the early half of last century homoeopaths got good results by giving very low dosages - 4-6 drops of mother (herbal) tinctures in a little water - twice daily. The whole art of drainage remedies developed around this approach. Herbalists, on the other hand, tend to give much higher dosages - 30-40 drops (and more) in a little water 2-3 times daily. If anyone is unsure which approach to follow, begin with a low dosage for around 10 days, and then work up to a higher one, if not satisfied with initial results.
Aqua, alcohol*, elderberry (Sambucus nigra)*.