Co-Trimoxazole

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What Is Co-Trimoxazole?

Co-Trimoxazole is a branded generic of sulfamethoxazole 400 mg + trimethoprim 80 mg, an oral antibiotic formulation commonly used for UTIs and other bacterial infections. Manufactured by Cipla.

Kliniska användningsområden

• Uncomplicated UTI (cystitis): 160/800 mg twice daily for 3 days in areas of low TMP-SMX resistance.
• Complicated UTI / pyelonephritis: 7–14 days.
• Pneumocystis jirovecii pneumonia (treatment and prophylaxis in HIV/immunocompromised).
• Toxoplasmosis prophylaxis in HIV.
• Skin and soft tissue infections, particularly MRSA-covered.
• Traveller’s diarrhoea (short course).

Hur man tar

1. Swallow with water, generally with food to reduce GI upset.
2. For UTI: complete the full course (3 days for uncomplicated cystitis, up to 14 days for complicated infections) even if symptoms resolve.
3. Stay well hydrated.
4. Stay well hydrated — TMP-SMX can crystallise in dehydrated patients.
5. If no improvement after 48–72 hours, return for urine culture + sensitivity testing — possible resistance.

Biverkningar

Vanligt: nausea, vomiting, rash, photosensitivity, headache.

Significant: hyperkalaemia (especially with ACE inhibitors, ARBs), hyponatraemia, Stevens-Johnson syndrome (rare), bone marrow suppression with prolonged use.

Rare serious: severe allergic reactions (sulfa allergy — very common and must be documented), TEN, DRESS syndrome, acute kidney injury.

Who Should Not Take Co-Trimoxazole

• Sulfa allergy (cross-reactivity)
• Third trimester of pregnancy (kernicterus risk in newborn)
• Infants under 2 months
• Svår njur- eller leversvikt
• G6PD deficiency (haemolysis risk)
• Megaloblastic anaemia from folate deficiency
• Known hypersensitivity to the active

Resistance Patterns and When to Culture

E. coli resistance rates vary regionally. In the US/UK, trimethoprim-sulfamethoxazole resistance is often 25–30% for community UTI isolates — making it a second-line rather than first-line empirical choice in many guidelines. Nitrofurantoin and fosfomycin often have lower resistance rates. Always request a urine culture + sensitivity when: recurrent UTIs, pyelonephritis, pregnancy, treatment failure, men with UTI, complicated UTI, or recent antibiotic use.

Förvaring

Store at room temperature (15–25 °C). Keep tablets in original blister, away from moisture. Keep out of reach of children.

Vanliga frågor

How fast will my UTI symptoms improve?

Symptoms typically improve within 24–48 hours. Complete the full course (3 days for uncomplicated UTI) even if you feel better — stopping early risks recurrence and resistance.

What if the antibiotic doesn't work?

Symptoms persisting after 48–72 hours suggest resistance or wrong diagnosis. Return for urine culture + sensitivity. Do not start a second antibiotic without cultures.

Is it normal to get a yeast infection after antibiotics?

Common, especially with broad-spectrum antibiotics that disrupt vaginal flora. Topical or oral antifungal (fluconazole 150 mg single dose) resolves it. Probiotic combinations aim to reduce this risk.

Can I take Co-Trimoxazole in pregnancy?

Third trimester contraindicated. First/second trimester can be used with caution. Nitrofurantoin is often preferred for UTI in pregnancy (first and second trimester; avoid at term).

Can I drink alcohol?

No strong interaction, but heavy alcohol can worsen GI side effects and delay recovery. Moderate intake is generally OK.

Do I need to finish the whole course?

Yes. Stopping early when symptoms resolve leaves residual bacteria that can re-establish infection and select for resistance.

Can I take Co-Trimoxazole with birth control pills?

Most antibiotics (except rifampicin/rifabutin) do NOT reduce OCP efficacy despite old advice. Continue your usual pills.

Why might I keep getting UTIs?

Recurrent UTIs (≥2/6 months or ≥3/year) warrant investigation — sex as trigger, post-menopausal atrophy, anatomical issues, diabetes, residual bacteria from incomplete treatment. Post-coital prophylaxis, nightly low-dose prophylaxis, or vaginal estrogen (post-menopause) are options.

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