Bactrim DS Tablet: Complete Medicine Guide
Clinical Reference Standards: CDSCO (Central Drugs Standard Control Organisation), Indian Pharmacopoeia (IP) & WHO | Last Updated: September 2026
When to Call Your Doctor IMMEDIATELY
- Spreading rash, blisters, or peeling skin
- Sores in the mouth, eyes, or genitals
- Fever, sore throat, or unusual bleeding or bruising
- Decreased urine output or blood in urine
- Yellowing of the skin or eyes
- Severe abdominal pain or persistent diarrhea
- Difficulty breathing or swelling of the face, lips, or throat
- Irregular heartbeat or palpitations
If experiencing severe symptoms, call emergency services immediately.
What is chemotrin forte 800mg/160mg tablet used for?
This medicine is a combination antibiotic containing sulfamethoxazole and trimethoprim. It is used to treat bacterial infections such as urinary tract infections, respiratory infections, and skin infections, and to prevent and treat Pneumocystis jirovecii pneumonia. It works by blocking two steps in the bacterial folate synthesis pathway. It is available by prescription only and should be taken exactly as directed.
- Generic Name: Sulfamethoxazole + Trimethoprim
- Manufacturer: PCI Pharmaceuticals
- Form: Allopathy
- Pregnancy Category: Consult doctor
- Prescription Required: Yes
🇮🇳 chemotrin forte 800mg/160mg tablet के बारे में (Hindi Summary)
उपयोग: यह दवा सल्फामेथोक्साज़ोल और ट्राइमेथोप्रिम का संयोजन है, जिसका उपयोग बैक्टीरियल संक्रमणों के इलाज के लिए किया जाता है। यह मूत्र मार्ग संक्रमण, श्वसन तंत्र संक्रमण, त्वचा संक्रमण, और पेट के कुछ संक्रमणों के इलाज में प्रभावी है। यह निमोनिया के एक विशेष प्रकार, जिसे न्यूमोसिस्टिस जीरोवेसी निमोनिया कहा जाता है, के इलाज और रोकथाम में भी उपयोग किया जाता है, खासकर उन रोगियों में जिनकी प्रतिरक्षा प्रणाली कमजोर है। यह दवा बैक्टीरिया के भीतर फोलेट बनाने की प्रक्रिया को रोककर उन्हें मार देती है। यह दवा केवल डॉक्टर के पर्चे पर ही मिलती है और इसे डॉक्टर के निर्देशानुसार ही लेना चाहिए।
साइड इफेक्ट्स: इस दवा के सामान्य दुष्प्रभावों में जी मिचलाना, उल्टी, दस्त, भूख न लगना, सिरदर्द और त्वचा पर चकत्ते शामिल हैं। ये आमतौर पर हल्के होते हैं और कुछ दिनों में ठीक हो जाते हैं। गंभीर दुष्प्रभाव दुर्लभ हैं, लेकिन इनमें त्वचा की गंभीर प्रतिक्रियाएं, रक्त विकार, गुर्दे की समस्या, यकृत की सूजन और गंभीर एलर्जी शामिल हो सकती हैं। अगर आपको त्वचा पर फैलता हुआ दाना, छाले, मुंह में घाव, बुखार, गले में खराश, असामान्य रक्तस्राव, पेशाब में कमी, आंखों या त्वचा का पीलापन, या सांस लेने में कठिनाई हो, तो तुरंत डॉक्टर से संपर्क करें।
सुरक्षा सलाह: इस दवा को डॉक्टर के बताए अनुसार ही लें और बीच में न छोड़ें, भले ही आपको बेहतर महसूस होने लगे। दिन भर पर्याप्त पानी पिएं ताकि गुर्दे की समस्या से बचा जा सके। धूप में ज्यादा देर न रहें और सनस्क्रीन का इस्तेमाल करें, क्योंकि यह दवा त्वचा को धूप के प्रति संवेदनशील बना सकती है। अपने डॉक्टर को अपनी सभी दवाओं के बारे में बताएं, खासकर खून पतला करने वाली दवाएं, मधुमेह की दवाएं और पानी की गोलियां। अगर आप गर्भवती हैं, गर्भधारण की योजना बना रही हैं या स्तनपान करा रही हैं, तो डॉक्टर से सलाह लें। इस दवा को कमरे के तापमान पर सूखी जगह पर रखें और बच्चों की पहुंच से दूर रखें।
💊 chemotrin forte 800mg/160mg tablet Uses & Benefits
[{"condition":"Urinary tract infections","description":"This medicine is commonly used to treat uncomplicated and complicated urinary tract infections caused by susceptible bacteria such as Escherichia coli and Klebsiella species.","evidence":"Well-established"},{"condition":"Respiratory tract infections","description":"It is used for acute exacerbations of chronic bronchitis and other respiratory infections when caused by susceptible organisms.","evidence":"Well-established"},{"condition":"Skin and soft tissue infections","description":"This medicine can treat infections such as cellulitis and abscesses caused by susceptible bacteria, including community-associated methicillin-resistant Staphylococcus aureus in some settings.","evidence":"Well-established"},{"condition":"Pneumocystis jirovecii pneumonia","description":"It is a first-line treatment and prophylaxis for Pneumocystis jirovecii pneumonia in immunocompromised patients, including those with HIV/AIDS.","evidence":"Well-established"},{"condition":"Gastrointestinal infections","description":"It is used to treat traveler's diarrhea and other bacterial enteritis caused by susceptible organisms.","evidence":"Well-established"},{"condition":"Toxoplasmosis","description":"This medicine is used as an alternative treatment for toxoplasmic encephalitis in patients who cannot tolerate standard therapy.","evidence":"Moderate"},{"condition":"Nocardiosis","description":"It is used as a treatment option for infections caused by Nocardia species.","evidence":"Moderate"}]
Off-label uses: [{"condition":"Community-acquired methicillin-resistant Staphylococcus aureus skin infections","description":"Sometimes used off-label when other options are not suitable, based on local resistance patterns.","evidence":"Limited"},{"condition":"Prophylaxis in neutropenic patients","description":"Occasionally used off-label to prevent bacterial infections in patients with low white blood cell counts.","evidence":"Limited"},{"condition":"Granulomatosis with polyangiitis","description":"Used off-label as maintenance therapy in some patients with this autoimmune condition.","evidence":"Limited"}]
Primary treatment for: Bacterial infections
Also treats: Urinary tract infections, Respiratory tract infections, Skin and soft tissue infections, Pneumocystis jirovecii pneumonia, Gastrointestinal infections, Toxoplasmosis, Nocardiosis
📋 Drug Information
| Generic Name(s) | Sulfamethoxazole + Trimethoprim |
| Brand Name | Antrima DS |
| Manufacturer | PCI Pharmaceuticals |
| Packaging / Form | Varies by brand (Allopathy) |
| Therapeutic Class | ANTI INFECTIVES |
| Action Class | Sulfonamide + Folate antagonist |
| Route of Administration | Oral |
| Storage | Store at room temperature between 15°C and 30°C (59°F to 86°F) in a dry place, away from direct sunlight and moisture. Keep the tablets in their original container with the lid tightly closed. Do not store in the bathroom. Keep out of reach of children and pets. |
| Shelf Life | The shelf life is typically 24 to 36 months from the date of manufacture, depending on the manufacturer. Check the expiry date on the packaging before use. |
| WHO Guideline | The World Health Organization includes sulfamethoxazole-trimethoprim in its Model List of Essential Medicines for the treatment of several bacterial infections and for prophylaxis and treatment of Pneumocystis jirovecii pneumonia in immunocompromised patients. Specific recommendations should be verified with current WHO guidelines. |
| ICMR Guideline | The Indian Council of Medical Research has published treatment guidelines for various infectious diseases that may include sulfamethoxazole-trimethoprim as a treatment option based on local resistance patterns. Clinicians should refer to the latest ICMR guidelines for specific recommendations. |
👨⚕️ Doctor's Practical Tips
Evidence-based practical advice from experienced clinicians
🔍 Is This Medicine Right for Your Symptom?
Educational reference. Always consult a doctor for diagnosis.
🔬 How This Medicine Works (Pharmacology)
Pharmacokinetics
How It Works
This medicine works by inhibiting two sequential steps in the bacterial folate synthesis pathway. Sulfamethoxazole is a structural analog of para-aminobenzoic acid and competitively inhibits dihydropteroate synthase, preventing the formation of dihydrofolic acid. Trimethoprim inhibits dihydrofolate reductase, blocking the conversion of dihydrofolic acid to tetrahydrofolic acid. This sequential blockade produces a synergistic bacteriostatic effect, and in some cases bactericidal activity, by depriving bacteria of the folate cofactors needed for DNA, RNA, and protein synthesis. Human cells obtain folate from the diet and are less affected because trimethoprim has much higher affinity for bacterial dihydrofolate reductase than for the human enzyme.
Mechanism Steps
💡 How to Take chemotrin forte 800mg/160mg tablet
Strength: Each tablet contains sulfamethoxazole 800 mg and trimethoprim 160 mg.
Dosage Information
| Adult Dosage | The usual adult dose of this medicine for most infections is one tablet (800 mg sulfamethoxazole and 160 mg trimethoprim) taken orally every 12 hours. For uncomplicated urinary tract infections, a shorter course of 3 to 7 days may be sufficient. For Pneumocystis jirovecii pneumonia, the dose and duration are determined by the treating physician based on the severity of the infection and the patient's immune status. Dose must be individualized by a qualified clinician based on indication, age, weight, renal and hepatic function. |
| Pediatric Dosage | Pediatric dosing is not established from available information. Consult a pediatrician. This medicine is generally not recommended for infants under 2 months of age. For older children, dosing is based on body weight and the specific indication, and must be determined by a qualified clinician. |
| Elderly Dosage | Elderly patients may be more sensitive to the effects of this medicine, especially if they have reduced kidney or liver function. Dose adjustments may be necessary based on renal function. Elderly patients should be monitored closely for side effects such as hyperkalemia, hypoglycemia, and blood disorders. Dose must be individualized by a qualified clinician. |
| Renal Impairment | Dose adjustment is required in patients with renal impairment. For patients with a creatinine clearance of 15-30 mL/min, the dose may need to be reduced by 50%. For patients with a creatinine clearance below 15 mL/min, this medicine is generally not recommended unless the benefits outweigh the risks, and close monitoring is required. Dose must be individualized by a qualified clinician based on renal function. |
| Hepatic Impairment | This medicine should be used with caution in patients with hepatic impairment. Dose adjustment may be necessary, and liver function should be monitored closely. In severe hepatic impairment, this medicine is contraindicated. Dose must be individualized by a qualified clinician. |
| Maximum Daily Dose | The maximum recommended daily dose for adults with normal renal function is 1600 mg sulfamethoxazole and 320 mg trimethoprim (two double-strength tablets per day). Higher doses may be used in specific severe infections under close medical supervision. |
Dosage Timeline
🍽️ Food Timing Guide
⏰ What to Do If You Miss a Dose
⚠️ Side Effects of chemotrin forte 800mg/160mg tablet
✅ Common Side Effects
🚨 Serious Side Effects
⚠️ Rare Side Effects
Consult your doctor if you experience any unusual symptoms.
🔬 Drug Interactions
| Drug | Severity | Effect |
|---|---|---|
| Warfarin | Major | |
| Methotrexate | Major | |
| Phenytoin | Major | |
| ACE inhibitors | Major | |
| Potassium-sparing diuretics | Major | |
| Dofetilide | Major | |
| Amiodarone | Moderate | |
| Rifampicin | Moderate | |
| Cyclosporine | Moderate | |
| Digoxin | Moderate |
🚨 Major Interactions
- Warfarin
- Methotrexate
- Phenytoin
- ACE inhibitors and angiotensin receptor blockers
- Potassium-sparing diuretics
- Dofetilide
⚡ Moderate Interactions
- Amiodarone
- Sotalol
- Procainamide
- Rifampicin
- Cyclosporine
- Digoxin
🍷 Alcohol Interaction
Alcohol should be avoided while taking this medicine because it can increase the risk of liver toxicity and may worsen side effects such as nausea, dizziness, and drowsiness. If you drink alcohol regularly, discuss this with your doctor before starting this medicine.
🔎 Check Your Other Medicines
Educational tool. Always confirm with your doctor or pharmacist.
🛡️ Safety & Warnings
🚫 Contraindications
["Known hypersensitivity to sulfonamides or trimethoprim","Pregnancy at term and during breastfeeding","Infants less than 2 months of age","Severe hepatic impairment","Severe renal impairment without specialist supervision","Known glucose-6-phosphate dehydrogenase deficiency","History of drug-induced immune thrombocytopenia with sulfonamides or trimethoprim","Megaloblastic anemia due to folate deficiency"]
⚠️ Warnings & Precautions
["Serious skin reactions such as Stevens-Johnson syndrome and toxic epidermal necrolysis can occur. Stop the medicine and seek immediate medical attention if a rash develops.","Blood dyscrasias including agranulocytosis, aplastic anemia, and thrombocytopenia have been reported. Monitor blood counts regularly.","Acute kidney injury and crystalluria can occur. Maintain adequate fluid intake.","Hepatotoxicity has been reported. Monitor liver function tests.","Hyperkalemia can occur, especially in patients with renal impairment or those taking ACE inhibitors, angiotensin receptor blockers, or potassium-sparing diuretics.","Hypoglycemia has been reported, particularly in elderly patients and those with renal impairment.","This medicine can cause photosensitivity. Avoid prolonged sun exposure and use sunscreen.","Clostridioides difficile-associated diarrhea can occur. Seek medical attention if severe diarrhea develops.","Use with caution in patients with porphyria, thyroid dysfunction, or bronchial asthma.","Do not use in patients with a history of sulfonamide-induced immune thrombocytopenia."]
🤱 Lactation Safety
This medicine is excreted in breast milk and may cause serious adverse reactions in a nursing infant. It should be used with caution in breastfeeding women, and alternatives may be preferred, especially when nursing a premature infant or an infant with jaundice, or when the mother has a known glucose-6-phosphate dehydrogenase deficiency.
💊 Overdose Management
Overdose of this medicine can cause nausea, vomiting, dizziness, headache, mental depression, confusion, and bone marrow suppression. In severe cases, crystalluria, hematuria, and jaundice may occur. Treatment is supportive and symptomatic. Gastric lavage may be considered if the overdose is recent. Adequate hydration should be maintained to prevent crystalluria. Hemodialysis may be considered in severe cases. Contact a poison control center or emergency department immediately if overdose is suspected.
⏰ Missed Dose
If you miss a dose, take it as soon as you remember. If it is almost time for your next dose, skip the missed dose and continue with your regular schedule. Do not take two doses at the same time to make up for a missed dose.
Additional Safety Advice
Take this medicine exactly as prescribed by your doctor, and do not skip doses or stop early even if you feel better. Drink plenty of water throughout the day to help prevent kidney problems. Avoid prolonged sun exposure and use sunscreen, because this medicine can make your skin more sensitive to sunlight. Tell your doctor about all other medicines you take, especially blood thinners, diabetes medicines, and water pills. Do not take this medicine if you are pregnant, planning pregnancy, or breastfeeding without consulting your doctor. Keep all follow-up appointments and blood tests as advised. Store this medicine at room temperature away from moisture and heat, and keep it out of reach of children.
👴 Special Considerations for Elderly
💡 For Patients Above 65
Elderly patients are at higher risk of side effects from this medicine, including hyperkalemia, hypoglycemia, blood disorders, and kidney problems. Dose adjustments may be necessary based on kidney function. Elderly patients should be monitored closely with regular blood tests. They should also be advised to maintain adequate hydration and report any unusual symptoms promptly.
🤰 Pregnancy Planning (TTC)
If you are planning to become pregnant, discuss this medicine with your doctor before starting treatment. This medicine is generally avoided during pregnancy, especially in the first trimester and near term, due to potential risks to the fetus. Your doctor may recommend an alternative antibiotic that is safer for use during pregnancy. If you become pregnant while taking this medicine, contact your doctor immediately.
🏥 Post-Surgery Considerations
If you are scheduled for surgery, inform your surgeon and anesthesiologist that you are taking this medicine. This medicine may interact with certain medications used during surgery and can affect blood clotting and kidney function. Your doctor may recommend stopping the medicine before surgery or adjusting the dose. Follow your healthcare team's instructions carefully.
🦷 Dental Procedures
Inform your dentist that you are taking this medicine before any dental procedure. This medicine may interact with certain medications used in dentistry and can increase the risk of bleeding. Your dentist may recommend adjusting your medication or taking extra precautions. Maintain good oral hygiene and follow your dentist's advice.
💚 Lifestyle Tips for Better Results
🏋️ Exercise Considerations
This medicine may cause dizziness or fatigue in some patients. If you experience these effects, avoid strenuous exercise or activities that require mental alertness, such as driving or operating heavy machinery, until you know how the medicine affects you. Mild to moderate exercise is generally safe if you feel well, but listen to your body and rest when needed.
🥗 Diet Recommendations
💼 Impact on Daily Work & Life
This medicine may cause dizziness, fatigue, or headache in some patients, which can affect your ability to drive or operate machinery. If you experience these side effects, avoid driving or operating heavy machinery until you know how the medicine affects you. Most people can continue their normal daily activities while taking this medicine, but it is important to take it as prescribed and attend follow-up appointments. If your work involves exposure to sunlight, take extra precautions to protect your skin.
🛑 When to Stop This Medicine
Do not stop taking this medicine without consulting your doctor, even if you feel better. Stopping early can allow the infection to return and may contribute to antibiotic resistance. Your doctor will determine the appropriate duration of treatment based on the type and severity of the infection. If you experience serious side effects such as a severe rash, difficulty breathing, or signs of liver or kidney problems, stop the medicine and seek immediate medical attention.
📅 Long-Term Use Effects
Long-term use of this medicine may increase the risk of blood disorders, kidney problems, liver toxicity, and hyperkalemia. It can also lead to the development of antibiotic resistance and Clostridioides difficile-associated diarrhea. Regular monitoring of blood counts, kidney function, liver function, and potassium levels is recommended during prolonged therapy. The medicine should be used for the shortest duration necessary to treat the infection.
🌿 Non-Medicine Approaches
These can complement medicine but do not replace prescribed treatment.
An alternative antibiotic for uncomplicated urinary tract infections.
Evidence: Well-establishedA fluoroquinolone antibiotic that can be used for various bacterial infections.
Evidence: Well-establishedA beta-lactam antibiotic combination used for respiratory, skin, and urinary tract infections.
Evidence: Well-establishedA tetracycline antibiotic used for respiratory, skin, and sexually transmitted infections.
Evidence: Well-established💉 Vaccination Considerations
💉 If You're Getting Vaccinated
This medicine does not interact with most vaccines. However, if you are scheduled to receive a live vaccine, inform your doctor that you are taking this antibiotic. In general, antibiotics do not interfere with the immune response to vaccines, but it is always best to consult your healthcare provider.
📦 Storage Guide
✅ DO
Store at room temperature between 15°C and 30°C (59°F to 86°F).
❌ DON'T
Do not refrigerate unless specified on the label.
✅ DO
Keep in the original container with the lid tightly closed.
❌ DON'T
Do not transfer to unmarked containers.
✅ DO
Keep away from direct sunlight and moisture.
❌ DON'T
Do not store in the bathroom cabinet.
✅ DO
Keep out of reach of children and pets.
❌ DON'T
Do not use after the expiry date.
✈️ Traveling with This Medicine
When traveling with this medicine, carry it in its original packaging with the prescription label clearly visible. Bring a copy of your prescription or a letter from your doctor, especially for international travel, as some countries have strict rules about importing antibiotics. Store the medicine in a cool, dry place away from direct sunlight and moisture. If you are crossing time zones, adjust your dosing schedule gradually to maintain even intervals, but consult your doctor for specific advice. Keep the medicine in your carry-on luggage rather than checked baggage to avoid loss or temperature extremes. Declare the medicine to customs if required.
💰 Cost Analysis & Savings
👥 Real Patient Stories
Educational, anonymized scenarios. Individual results may vary.
💬 Questions Patients Often Ask
A: You may start to feel better within 24 to 48 hours after starting this medicine. However, it is important to complete the full course as prescribed, even if you feel better, to ensure the infection is fully treated.
A: Yes, you can take this medicine with or without food. Taking it with food may help reduce stomach upset and nausea.
A: If you miss a dose, take it as soon as you remember. If it is almost time for your next dose, skip the missed dose and continue with your regular schedule. Do not take two doses at the same time.
A: It is best to avoid alcohol while taking this medicine because it can increase the risk of liver problems and worsen side effects such as nausea and dizziness.
A: This medicine should be used during pregnancy only if the potential benefit justifies the potential risk. It is generally avoided in the first trimester and near term. Consult your doctor for personalized advice.
A: Seek immediate medical attention if you develop a spreading rash, blisters, peeling skin, sores in the mouth or eyes, fever, sore throat, unusual bleeding or bruising, decreased urine output, yellowing of the skin or eyes, or difficulty breathing.
🤔 Common Patient Concerns
🔄 Substitutes for chemotrin forte 800mg/160mg tablet
View AllAlternative brands with exact same active ingredient:
-
supristol ds 800mg/160mg tabletZydus Cadila ₹8.94 36.4% CHEAPER
-
cortina ds 800mg/160mg tabletLupin Ltd ₹10.17 27.7% CHEAPER
-
antrima ds 800mg/160mg tabletAbbott ₹10.29 26.8% CHEAPER
-
osotrim ds 800mg/160mg tabletOsho Pharma Pvt Ltd ₹10.31 26.7% CHEAPER
-
Sepnil DS 800mg/160mg TabletTOSC International Pvt Ltd ₹10.31 26.7% CHEAPER
Medical Note: Always consult your doctor before switching medications.
🛑 Myths vs. Facts
- Myth: This medicine can cure viral infections like the common cold.
Fact: This medicine is an antibiotic and is only effective against bacterial infections. It does not treat viral infections. - Myth: You can stop taking this medicine as soon as you feel better.
Fact: You should complete the full course as prescribed to prevent the infection from returning and to reduce the risk of antibiotic resistance. - Myth: This medicine is safe to take during pregnancy.
Fact: This medicine should be used during pregnancy only if the potential benefit justifies the potential risk. It is generally avoided in the first trimester and near term. - Myth: This medicine can be taken without a prescription.
Fact: This medicine is a prescription-only antibiotic and should only be taken under the supervision of a qualified clinician. - Myth: Taking this medicine with alcohol is safe.
Fact: Alcohol should be avoided while taking this medicine because it can increase the risk of liver problems and worsen side effects.
🔄 Alternative Options
Generic Alternatives
- Sulfamethoxazole and trimethoprim double-strength tablets
- Co-trimoxazole double-strength tablets
Brand Alternatives
- Bactrim DS
- Septran DS
- Ciplin DS
- Urotrim DS
- Trimoxazole DS