Trimethoprim 100mg Tablets (POM) - 28 Tablets
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Product Overview
Prescription trimethoprim 100mg tablets for UTIs and other susceptible infections when prescribed. Pack of 28.
Description
Trimethoprim 100mg Tablets (28 tablets) are a prescription-only antibiotic used to treat susceptible bacterial infections, including urinary tract infections (UTIs) and some respiratory tract infections, when prescribed by a clinician.
Trimethoprim works by stopping bacteria from making folic acid, which they need to grow and multiply. This helps the body clear the infection.
Pack size: 28 tablets (commonly supplied as 2 × 14 tablets depending on supplier).
How to Use
Always take exactly as directed on the dispensing label.
How to take
- Swallow tablets with water.
- Take doses evenly spaced through the day.
- Keep taking it for the full course unless your prescriber tells you to stop.
Typical doses shown in UK prescribing information (for this strength)
- Adults and children over 12 years (acute infection): 200mg twice daily (this is usually 2 × 100mg tablets per dose).
- Long-term prevention of recurrent UTIs (adults and over 12s): 100mg at night (1 tablet), if prescribed.
- Children 6–12 years (acute infection): 100mg twice daily.
If you miss a dose, take it when you remember unless it’s nearly time for the next dose. Do not take a double dose. (Follow leaflet/label advice.)
Ingredients
Active ingredient: Trimethoprim 100mg per tablet.
Other ingredients (excipients): Lactose monohydrate, maize starch, microcrystalline cellulose, sodium starch glycolate (Type A), povidone, colloidal anhydrous silica, magnesium stearate, stearic acid.
Contains lactose: 67.5mg lactose per tablet.
Side Effects & Warnings
Prescription-only medicine.
Do not take if:
- You are allergic to trimethoprim or any ingredients.
- You are pregnant (listed as contraindicated in the referenced UK product information).
Speak to a clinician urgently / stop and seek help if you get:
- A severe skin reaction or widespread rash, blistering, peeling, or mouth/eye sores.
- Signs of blood problems (unusual bruising/bleeding, sore throat, fever, severe tiredness).
- Symptoms of high potassium (muscle weakness, abnormal heartbeat), especially if you have kidney problems or take medicines that raise potassium.
Common side effects can include mild stomach upset (nausea/vomiting) and skin rash/itching.
Important interactions/precautions
- Extra care is needed with kidney impairment, folate deficiency, and when taking medicines that can raise potassium (for example ACE inhibitors/ARBs, potassium-sparing diuretics).