Nitrobest 100 (Lupin) is a tablet containing nitrofurantoin 100 mg, a urinary antibiotic. It is used to treat and prevent bacterial urinary tract infections (UTIs) and should be taken only as your doctor prescribes.
Last reviewed: November 2026. General information only, not medical advice. Contents and strengths can differ by manufacturer and batch, so always check your pack and follow your doctor.
Quick Facts
| Brand | Nitrobest (Lupin) |
| Form | Tablet 100 mg, strip of 10 |
| Active ingredient | Nitrofurantoin 100 mg |
| Class | Urinary antiseptic / antibiotic |
| Used for | Bacterial urinary tract infections |
| Prescription | Orders depend on prescription verification where applicable |
Nitrobest 100 Composition
- Nitrofurantoin (100 mg): an antibiotic that concentrates in the urine and kills the bacteria causing the infection.
What Is Nitrobest 100 Used For?
- Treating bacterial urinary tract infections such as cystitis
- Preventing repeat UTIs, when your doctor advises it
- It does not work against viral infections
How It Works
Nitrofurantoin kills bacteria in the bladder and urinary tract. Because it reaches high levels in the urine, it is mainly useful for urinary infections.
How to Take It
Take it with food or milk, swallowed whole, at the same time each day as your doctor directs. Finish the full course even if you feel better, because stopping early can let the infection return and add to antibiotic resistance. If you miss a dose, take it when you remember unless the next dose is near, and never double up.
Possible Side Effects
Common side effects include:
- Nausea or stomach pain
- Headache
- Gas, constipation or diarrhoea
- Drowsiness or dizziness
Seek medical help for a cough or breathing trouble, numbness or tingling in the hands or feet, severe diarrhoea, yellow skin or eyes, or a severe rash.
Precautions and Who Should Be Careful
- Do not use it if you are allergic to nitrofurantoin.
- Avoid it in liver or kidney problems, jaundice or acute porphyria unless your doctor decides otherwise.
- Pregnancy: avoid unless your doctor prescribes it. Tell your doctor if you are pregnant or planning pregnancy.
- Breastfeeding: tell your doctor first.
- Avoid alcohol while taking it.
- Tell your doctor if you have lung, kidney or liver problems, anaemia, diabetes, vitamin B deficiency or an electrolyte imbalance.
- Antacids, water pills and gout medicines such as probenecid can interact with it.
Key Points to Remember
- Take it with food or milk and finish the full course.
- It treats bacterial UTIs only. Antibiotics do not help colds or flu.
- Report a new cough, breathing trouble or tingling in your hands or feet.
When to Contact a Doctor
- Fever, back or flank pain, or vomiting, which can mean the infection has reached the kidneys
- A new cough, chest pain or breathing trouble
- Numbness or tingling in hands or feet
- No improvement in urinary symptoms after 2 to 3 days
Practical Tips
- Drink plenty of water to help flush the bladder.
- Do not hold urine for long periods.
- Wipe front to back and pass urine after intimacy to lower the risk of repeat UTIs.
- Do not use leftover antibiotics for a new infection.
Questions to Ask Your Doctor or Pharmacist
- Do I need a urine test to confirm the infection and the right antibiotic?
- How many days should I take it?
- Is it safe with my kidney or other conditions?
- What can I do to avoid repeat infections?
- Doxyday Tablet: Uses, Doxycycline 100 mg, Side Effects & FAQs
- Entamizole Forte Tablet: Uses, Composition, Side Effects & Precautions
Frequently Asked Questions
What is Nitrobest used for?
It is used for bacterial urinary tract infections.
Should I take Nitrobest with food?
Yes. Taking it with food or milk helps the body absorb it and lessens stomach upset.
Can I drink alcohol with Nitrobest?
It is best to avoid alcohol while on this medicine.
Can I stop when the burning stops?
No. Finish the full course your doctor prescribed.