I find drugs.com useful, which seems to be derived from product monographs. Knowing that "very common", "common", "uncommon", "rare" and "very rare" have specif

I find drugs.com useful, which seems to be derived from product monographs. Knowing that "very common", "common", "uncommon", "rare" and "very rare" have specific meanings (e.g. common -> 1%-10%) helps.