In the early 1900's ammonia was needed to make sulfa drugs but that's on a commercial production level and there's much easier ways to get mass amounts of ammon

In the early 1900's ammonia was needed to make sulfa drugs but that's on a commercial production level and there's much easier ways to get mass amounts of ammonia without milking cows for urine. On a more accessible level, low amounts of ammonia is useful for topical treatments of itch, like from bug bites.