Sulfa: They are bacteriostatic drugs; i.e., they inhibit the growth and multiplication of bacteria but do not kill them. They act by interfering with enzyme systems essential to normal metabolic and growth patterns of bacteria. Although more than 5,000 sulfa drugs have been prepared and tested, fewer than 20 continue to have therapeutic value because resistant strains of bacteria have developed.
Sulfa drugs are assigned to four groups based on the rapidity with which they are absorbed and excreted. The most common side effects of sulfa drugs include nausea, vomiting, and mental confusion. Other side effects include fever, skin eruptions, anemia, leukopenia, and irritation of the liver or kidneys. More potent antibacterial drugs have largely replaced the sulfa drugs. They are still used, however, in the treatment of urinary tract infection.
Calcium Sulphate=a white salt
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