Trimethoprim
About Trimethoprim
Trimethoprim is an oral medicine used to treat bacterial infections, most commonly acute urinary tract infections. It works by stopping the growth of the specific bacteria causing discomfort in your bladder and kidneys. This helps your body clear the infection quickly and effectively.
You will typically take this medicine once or twice a day as prescribed by your doctor. It is important to take it at the same times each day and complete the entire course, even if you start to feel better after a few days. You can take this medicine with or without food, but taking it with a meal can help prevent any mild stomach upset. Drinking plenty of water during your treatment is also highly recommended to keep your urinary tract clean.
Most people tolerate this medication well, though some may experience mild side effects like nausea, vomiting, or changes in taste. However, you must contact your doctor immediately if you experience severe symptoms such as a sudden skin rash, peeling skin, severe diarrhoea, or muscle weakness.
Before starting this treatment, talk to your doctor if you have kidney disease, liver damage, blood disorders, or a history of folate deficiency. Do not take this if you have severe kidney or liver disease or if you have a known history of severe blood disorders like anaemia caused by folate deficiency.
This medicine can interact with blood thinners, certain blood pressure drugs, and medications that affect your kidneys, altering how they work or increasing side effect risks. Avoid drinking alcohol during treatment as it can increase dehydration and dizziness, and consult your doctor before taking this if you are pregnant, breastfeeding, or an elderly individual.
Uses of Trimethoprim
• Bacterial Infections: Trimethoprim helps treat bacterial illnesses, including pneumonia and bronchitis. The composition of Trimethoprim improves efficacy against resistant microorganisms.
• Urinary Tract Infections (UTIs): Trimethoprim treats urinary tract infections caused by susceptible bacteria and provides broad-spectrum protection.
• Otitis Media: Trimethoprim helps to treat middle ear infections.
• Pneumonia: Trimethoprim is also involved in treating pneumonia by efficiently fighting against the microorganisms that cause the condition.
Medicinal Benefits
Trimethoprim provides reliable relief from the painful and disruptive symptoms of bacterial infections. By targeting the source of the infection, it helps you recover quickly so you can return to your normal daily routine without discomfort.
- Rapid Symptom Relief: Most patients notice a significant reduction in burning pain, urgency, and pelvic discomfort within the first 24 to 48 hours of treatment.
- Targeted Bacterial Defence: The medication focuses directly on the harmful bacteria causing the infection, minimising damage to the rest of your body's natural systems.
- Convenient Oral Administration: Available in easy-to-swallow tablets, it offers a simple and non-invasive way to treat infections without the need for clinical injections.
Directions for Use
- Trimethoprim can be taken with or without food or as advised by your doctor.
- Follow your doctor's instructions on the dosage and timing of this medication.
- Swallow Trimethoprim as a whole with a glass of water.
- Do not crush, break, or chew it.
Storage
Side Effects of Trimethoprim
Common Side Effects (Usually mild):
- Nausea or vomiting
- Upset stomach or mild abdominal discomfort
- Changes in your sense of taste
- Mild skin itching or temporary skin redness
Serious Side Effects (Consult a doctor right away):
- Signs of a severe allergic reaction, such as a severe skin rash, hives, swelling of the face, lips, or throat, or difficulty breathing
- Severe, watery, or bloody diarrhea, which may be accompanied by stomach cramps and fever
- Unusual bruising, bleeding, pale skin, sore throat, or fever (which can indicate a decrease in your blood cell counts)
- Muscle weakness, tingling sensation, or an irregular heartbeat (which can be signs of high potassium levels in your blood)
Drug Warnings
- Always complete the full course of therapy prescribed by your doctor, even if you feel completely better within a couple of days.
- If you experience a skin rash or itching at any point during your treatment, stop taking the medicine and contact your doctor immediately.
- Inform your doctor if you have a history of anaemia or low blood folate levels before starting this medicine.
- Let any healthcare provider or lab technician know you are taking this medication before you have blood or urine tests, as it can interfere with certain test results.
- If you are taking this medicine long-term, your doctor may require regular blood tests to monitor your kidney function and blood cell counts.
Drug Interactions
- Blood thinners (like warfarin): Trimethoprim can increase the blood-thinning effect, which may raise your risk of bleeding.
- Blood pressure medications (like ACE inhibitors or ARBs): Combining these can dangerously increase potassium levels in your blood, potentially affecting your heart rhythm.
- Methotrexate: This combination can increase the levels of methotrexate in your body, raising the risk of severe side effects like bone marrow suppression.
- Phenytoin: Trimethoprim may increase the levels of this seizure medicine in your system, potentially leading to toxic side effects.
Drug-Drug Interactions Checker List:
Safety Advice
Alcohol
unsafeAvoid alcohol consumption while taking Trimethoprim to prevent unpleasant side-effects, such as fast heartbeats, warmth or redness under your skin, tingly feeling, nausea, and vomiting.
Pregnancy
unsafeTrimethoprim is not recommended during pregnancy since it interferes with folic acid formation, which plays a crucial role in developing the unborn baby's brain and spinal cord. Please consult your doctor before taking Trimethoprim if you are pregnant or planning to conceive.
Breast Feeding
unsafeTrimethoprim is excreted into the breast milk. Please consult your doctor before taking Trimethoprim if you are breastfeeding.
Driving
unsafeIt is unknown whether Trimethoprim affects your ability to drive and operating machinery. Drive only if you are physically stable and mentally focussed. If you experience dizziness or fatigue after taking Trimethoprim, do not drive or operate any machinery.
Liver
consult your doctorLet your doctor know if you have any history of liver diseases before taking Trimethoprim.
Kidney
consult your doctorLet your doctor know if you have any history of kidney diseases before taking Trimethoprim.
Children
unsafeTrimethoprim is not recommended to children below 12 years.
Habit Forming
Diet & Lifestyle Advise
- Drink plenty of water: Increase your daily intake of fluids, particularly water, to help flush bacteria out of your urinary tract and keep your kidneys working efficiently.
- Avoid bladder irritants: While treating a urinary tract infection, avoid consuming alcohol, caffeine, carbonated drinks, and highly spicy foods, as these can irritate your bladder and prolong discomfort.
- Be careful with folic acid: Avoid taking high-dose folic acid supplements or multivitamins containing folic acid while taking this medicine, unless specifically advised by your doctor, as it can make the treatment less effective.
- Protect your skin: This medicine can make your skin more sensitive to the sun. Wear protective clothing, apply sunscreen, and limit your exposure to direct sunlight and tanning beds.
Special Advise
- Renal, hepatic, and blood function tests are advised during prolonged therapy to rule out any toxicity caused by an overdose of Trimethoprim.
- Clostridium difficile-associated diarrhoea (CDAD) is reported during the use of antibiotics like Trimethoprim. Please see your doctor if you experience prolonged diarrhoea.
- Monitor your blood sugar levels regularly since Trimethoprim may affect your blood glucose levels if you have diabetes.
- Trimethoprim is moderately removed during dialysis, hence let your doctor know if you are undergoing dialysis treatment so that the dose can be scheduled after the dialysis.
Patients Concern
Disease/Condition Glossary
Bacterial infectionoccurs when harmful bacteria grow in the body and cause illness. It can infect any part of the body and multiply very quickly. Bacteria occur in three basic shapes: spherical, rod-shaped, and spiral-shaped. Bacteria may be gram-positive (have thick cell walls) or gram-negative (do not have a cell wall). Some common symptoms of a bacterial infection include cough, fever, and tiredness.
Cystitis is an infection of the urinary tract caused by bacteria. It causes an inflammation of the bladder.
FAQs
Trimethoprim is used to treat bacterial infections of the ear and urinary tract, including cystitis (inflammation of the bladder) and respiratory tract.
Trimethoprim contains Trimethoprim, an antibacterial drug. It inhibits tetrahydrofolic acid formation and prevents the synthesis of bacterial nucleic acids and proteins that carry out bacteria's vital functions.
Trimethoprim should be used with proper caution and doctor consultation if you have any anaemia (due to folate deficiency), kidney or liver diseases, diabetes, vitamin deficiency (folate or folic acid), blood disorders like bone marrow suppression and G6PD deficiency (a genetic disorder that causes red blood cells to breakdown), mineral imbalances like high potassium levels (hyperkalaemia) or low levels of sodium in the blood, porphyria (a disorder of skin sensitivity to light), and muscle weakness.
Trimethoprim can affect the live vaccines, like the typhoid vaccine, and decrease their effectiveness. Please consult a doctor before you start Trimethoprim if you are undergoing any vaccinations.
Take this medication 2-3 hours before or after taking iron supplements, multivitamins, calcium supplements, antacids, and laxatives, since these products prevent the absorption of Trimethoprim. It is also advised to avoid dairy products like milk, yoghurt, and calcium-enriched juice.
It is recommended to complete the course of Trimethoprim even if you feel better as it is an antibiotic, and stopping it midway may lead to recurring infections. Continue taking Trimethoprim for as long as your doctor has prescribed to treat your condition effectually.
No, Trimethoprim does not cause addiction. It is not a habit-forming drug.
Consult the doctor if you do not feel better even after completing the course of treatment or if your condition worsens during treatment with Trimethoprim.
Common side effects of Trimethoprim include diarrhoea, nausea, vomiting, stomach upset, loss of appetite, changes in taste, and headache. If any of these effects persist or worsen, seek medical advice promptly.
You should avoid alcohol during your treatment. Alcohol can dehydrate your body, make urinary tract symptoms worse, and increase the risk of side effects like dizziness or nausea. Talk to your doctor or pharmacist if you have concerns.
Yes. Like many other antibiotics, this medicine can alter the balance of natural bacteria in your body, allowing yeast to grow. This can cause vaginal itching or discharge. Talk to your doctor or pharmacist if you notice these symptoms.
This medicine is generally not recommended during the first trimester of pregnancy because it can interfere with folic acid, which is critical for the baby's early development. If you are pregnant or planning to become pregnant, talk to your doctor or pharmacist to discuss safer options.
You can take this medication with or without food. If you find that the medicine upsets your stomach or causes mild nausea, taking it with a meal or snack can help prevent this. Talk to your doctor or pharmacist for personalised advice.
No, this medicine is an antibiotic that only targets bacterial infections. It will not work for viral illnesses like the common cold, flu, or acute bronchitis. Using antibiotics when they are not needed can lead to bacterial resistance.
Yes, it can make your skin more sensitive to ultraviolet (UV) light, which increases your risk of sunburn. It is best to wear sunscreen and protective clothing and avoid direct sun exposure or tanning beds while taking it. Talk to your doctor if you develop a sunburn-like rash.
Take the missed dose as soon as you remember. If it is close to the time for your next scheduled dose, skip the missed dose and continue with your normal schedule. Do not take a double dose to make up for a missed one. Talk to your doctor or pharmacist if you have questions about your schedule.
