Sulfa drugs are used as

Why are cimetidine and ranitidine better antacids than sodium hydrogencarbonate or magnesium or aluminium hydroxide?

Which of the following is a local anaesthetic?

By what other name are tranquilizers known?

Which of the following artificial sweeteners has the lowest sweetness value?

In the year $1904$,the German scientist Paul Ehrlich developed the first antimalarial drug,which was also necessary for common skin diseases. Name it.