Everything You Need To Know About Bactrim Dosage

Bactrim contains a combination of sulfamethoxazole and trimethoprim. Sulfamethoxazole and trimethoprim are two antibiotics that treat different types of bacterial infections.

Bactrim dosage is utilized to treat ear contaminations, urinary tract diseases, bronchitis, explorer's loose bowels, shigellosis, and Pneumocystis jiroveci pneumonia. 

Bactrim may also be used for purposes not mentioned in this drug guide.

Important Information

You should not use Bactrim if you have a history of severe liver or kidney disease, folate deficiency anemia or platelet hemorrhage due to the use of trimethoprim or a sulfonylurea.

Before you take this medicine

Bactrim Dosage
Bactrim Dosage
You must not use Bactrim if you are allergic to sulfamethoxazole or trimethoprim or if you
severe liver or kidney disease;

Anemia (deficiency of red blood cells) due to folic acid deficiency;

Platelet bleeding due to trimethoprim or a sulfonylurea.

To ensure Bactrim is ok for you, tell your specialist on the off chance that you: 

Kidney or liver diseases;

 A lack of folic acid;

Asthma or severe allergies;

A thyroid disorder;


Porphyria (a genetic enzymatic disorder that causes symptoms that affect the skin or the nervous system); Glucose-6-phosphate dehydrogenase deficiency (G6PD deficiency); or if you suffer from malnutrition.

Pregnancy category D. FDA. Do not use Bactrim if you are pregnant. This could harm the unborn child. Utilize viable contraception and tell your specialist in the event that you end up pregnant amid treatment.

Sulfamethoxazole and trimethoprim may pass into breast milk and be harmful to the breastfed baby. In the event that you are breastfeeding a child, converse with your specialist. Try not to offer Bactrim to a tyke more youthful than 2 months. 

Try not to offer Bactrim to a youngster more youthful than 2 months. 

Serious side effects may be more likely in older adults, especially in patients taking other medications such as digoxin or certain diuretics.

How should I take Bactrim?

Take Bactrim exactly as prescribed by your doctor. Follow all instructions on your prescription label. Try not to take this medication in bigger or littler amounts or for longer than suggested. 

Shake the Bactrim oral suspension (liquid) just before measuring a dose. Measure the liquid with a special measuring spoon or medicine cup. If you do not have a dosimeter, ask your pharmacist.

Use this medicine for the entire prescribed duration. Your symptoms may improve before the infection is completely eliminated. Missing doses may also increase the risk of additional antibiotic-resistant infection. Bactrim does not treat viral infections such as colds or flu.

Drink plenty of fluids to avoid kidney stones when you are taking trimethoprim and sulfamethoxazole.

This medicine may produce unusual results in some medical tests. Tell any specialist who treats you that you are utilizing Bactrim. 

Store at room temperature and protect from moisture, heat, and light.

What happens if I miss a dose?

Accept the missed measurement when you recall. Avoid the missed measurements when it's nearly time for your next booked dosage.

Do not take any additional medication to make up for the missed dose.

What happens if I overdose?

Consult an emergency physician or call the Poison Helpline at 1-800-222-1222.

What should I avoid?

Antibiotics can cause diarrhea, which can be a sign of a new infection. If you have watery or bloody diarrhea, stop taking this medicine and call your doctor. Do not use antidiarrheal drugs unless your doctor tells you so.

Avoid sun exposure or solarium. This medicine can make sunburn easier. Wear protective clothing and use sunscreen (SPF 30 or higher) outdoors.

Side effects of Bactrim

Get medical help if you have any of the following signs of an allergic reaction to Bactrim: hives; heavy breathing; Swelling of the face, lips, tongue or throat.Call your doctor immediately if you:

Watery or bloody diarrhea;

Pale skin, drowsiness or shortness of breath, rapid heartbeat, difficulty concentrating;

Sudden weakness or malaise, fever, chills, sore throat, new or aggravated cough;

Symptoms of cold or flu, swelling of the gums, painful wounds in the mouth, pain when swallowing, skin wounds;

Low sodium levels in the body - headache, confusion, slurred speech, severe weakness, vomiting, loss of coordination, imbalance;

Liver problems - upper abdominal pain, fatigue, dark urine, clay-colored stools, jaundice (yellowing of the skin or eyes); or

Severe skin reaction - fever, sore throat, swelling of the face or tongue, burning of the eyes, skin pain, followed by a red or purple rash that spreads (especially to the face or upper body) causing blisters and peeling.

Common side effects of Bactrim can be:

Nausea, vomiting, loss of appetite; or

Mild itching or rash.

This is certainly not a whole summary of responses and others may occur. Call your specialist for therapeutic counsel about reactions.

How Many Other Medications Does Bactrim Work?

Tell your doctor about all the medicines you take or stop taking during your Bactrim treatment, especially:

Leucovorin; or


This list is incomplete. Other medicines may interact with sulfamethoxazole and trimethoprim, including prescription and over-the-counter medicines, vitamins, and herbal products. All possible interactions are not listed in this medication guide.

Further information

Remember to keep this medicine and all other medicines out of the reach of children, never share your medication with other people and only use Bactrim for the prescribed indication.

Always consult your doctor to ensure that the information on this page applies to your personal situation.

Applies to sulfamethoxazole/trimethoprim: oral suspension, oral tablet

Other dosage forms:

Intravenous solution

In addition to its necessary effects, sulfamethoxazole/trimethoprim may cause side effects. Although all these side effects cannot occur, they may need a medical consultation.

See your doctor immediately if any of the following occurs while taking 

Abdominal or stomach pain

Black, tarry stools

Blistering, peeling, or loosening of the skin

Changes in skin color

Chest pain


A cough or hoarseness

Dark urine



Fever with or without chills

The general feeling of tiredness or weakness

A headache


Joint or muscle pain

Light-colored stools

Loss of appetite

Lower back or side pain

BACTRIM is contraindicated in pediatric patients younger than 2 months of age.

Urinary tract infections and shigellosis in adults and children as well as an acute middle ear infection in children:

Adults: The usual adult dose used to treat urinary tract infections is one BACTRIM DS (double strength) tablet or two BACTRIM tablets every 12 hours for 10 to 14 days. An identical daily dosage is used for 5 days in the treatment of Shigellosis.

Children: The recommended dose for children with urinary tract infections or acute otitis media is 40 mg/kg sulfamethoxazole and 8 mg/kg trimethoprim per 24 hours divided twice every 12 hours for 10 days. An identical daily dosage is used for 5 days in the treatment of Shigellosis.

Further information

Always consult your doctor to ensure that the information on this page applies to your personal situation.

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