Sulfa-Types,Uses,Precautions,Dosages And Treatment


Sulfa-Types,Uses,Precautions,Dosages And Treatment.

The sulfa or sulfonamide fights many kinds of bacteria, but they are weaker than many antibiotics and more likely to cause allergic reactions like itching and other problems. They are cheap and can be taken by mouth.

Sulfa comes in tablets of 500 mg, and mixture 500 mg in 5 ml.



  • Sulfadiazine
  • Sulfisoxazole
  • Sulfadimidine
  • Sulfamethoxazole
  • Co-trimoxazole
  • Sulfathiazole



The most important use of sulfa is for urinary infections. They may also be used for some ear infections and for impetigo and other skin infections with pus.

Not all the sulfas are used the same way or the same dosage. If you have a sulfonamide other than the ones listed above, be sure of the correct use and dosage before you use it.

Sulfathiazole which is listed among the types of sulfas above is very cheap and not recommended because it is more likely to cause side effects.

Sulfa do not work as well for diarrhea as they used to; because many of the microbes that cause diarrhea have become resistant to them. Also giving sulfas to someone who is dehydrated from diarrhea can cause dangerous kidney damage.



It is important to drink lots of water at least 8 glasses a day when taking sulfa, to prevent harm to the kidneys.

If the sulfa causes a rash, blisters, itching, joint pain, fever, lower back pain, blood in the urine. Stop taking it and drink lots of water.

Never give sulfa to a person who is dehydrated or to babies under one year old.

NOTE : To do any good, these sulfas must be taken in the right dose. Be sure to take enough but not too much.



200 mg /kg/day : tablets of 500 mg or a mixture with 500 mg in 5 ml.

Give 4 doses a day with lots of water and each dose give the following below :

  • Adults and children over 10 years old : 3 to 4 gm (6 to 8 tablets) for the first dose; then 1 gm (2 tablets) for the other doses.
  • Children between 6 to 10 years old : 750 mg (one and half tablets or teaspoons) in each dose.
  • Children between 1 to 5 years old : 500 mg (1 tablet or 1 teaspoon) in each dose.
  • Babies under 1 year old : Do not give sulfa. If you have no choice, give 250 mg (½ tablet or teaspoon) 4 times a day.


CO-TRIMOXAZOLE (sulfamethoxazole with trimethoprim)

This is known as Bactrim and septrin; they come in tablets of 100 mg.

sulfamethoxazole with 20 mg. trimethoprim tablets of 400 mg.

sulfamethoxazole with 80 mg. trimethoprim mixture of 200 mg.

sulfamethoxazole with 40 mg trimethoprim.


This combination medicine fights a wide range of bacteria and is less expensive than ampicillin.

Co-trimoxazole can be used to treat the following below :

  • Urinary infections.
  • Diarrhea with blood and fever (shingella).
  • Typhoid
  • Cholera
  • Brucellosis
  • Respiratory infections (pneumonia)
  • Impetigo
  • Ear infections
  • Chancroid
  • Gonorrhea



Using tablets of 400 mg sulfamethoxazole with 80 mg trimethoprim or the same dosage for teaspoons of mixture.

Give 2 doses a day with lots of water and in each dose, give the following below :

  • Adults and children over 12 years old : 2 tablets or 4 teaspoons.
  • Children between 9 to 12 years old : one and half tablets or 3 teaspoons.
  • Children between 4 to 8 years old : one tablet or 2 teaspoons.
  • Children between 1 to 3 years old : ½ tablet or 1 teaspoon.
  • Babies under 1 year old : Do not give. If you have no choice, give ¼ tablet or ½ teaspoon 2 times a day.

For urinary infections, give the above dose for 10 to 14 days.

For acute bronchitis and typhoid, give for 14 days.

For chancroid, give for 7 days.

For shigella, give for 5 to 10 days.

For gonorrhea that is resistant to penicillin, very high doses must be used.


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