How can we increase the excretion of acidic drugs like barbiturates, salicylic acid etc?(any change in urine pH)
By giving sodium bicarbonate which makes urine alkaline so acidic drug in alkaline pH is ionized and easily excreted through urine.
Diuretics
Acidic drugs remain ionised in basic solution. So alkaline the urine,it results in ionized state of drugs which are not absorbed again