Medicines & Supplements A to Z > Nitrofurantoin


Last updated on 19/03/2021.

Overview   |   Dosage   |    Side Effects   |   Precautions  |   Tips  |   Where To Buy  

GENERIC NAME: Nitrofurantoin


BRAND NAME(S) IN HONG KONG: Apo-Nitrofurantoin , Urobid / Urobilin / Urosina (contains Nitrofurantoin and Phenazopyridine)

DRUG CLASS: Antibiotic for urinary tract infections

USED FOR: Urinary tract infections


– 50mg, 100mg (tablets)

What is Nitrofurantoin for?

Nitrofurantoin is an antibiotic and urinary antiseptic that can be used to prevent and treat bladder infections (urinary tract infections [UTIs]). It is useful in both uncomplicated UTIs and recurrent UTIs. Women can take Nitrofurantoin to prevent bladder infections caused by having sexual intercourse.

How to use it?

Nitrofurantoin can be taken by mouth as tablets or capsules. It is safe to use in both children and adults. The dosages for different uses in adults are listed below:

For treatment of bladder infection

50-100 mg 4 times daily for 5-7 days. 

For prevention of recurrent bladder infections

50-100 mg once daily at night. 

For prevention of postcoital bladder infections (on demand dosing)

50-100 mg once, within 2 hours of sexual intercourse

What are the side effects of Nitrofurantoin?

Common side effects of Nitrofurantoin are nausea, vomiting, diarrhoea, headaches, dizziness, and loss of appetite. Long-term use of Nitrofurantoin can cause lung toxicity and neuropathy.

Who should not take Nitrofurantoin?

– People with G6PD deficiency
– Patients with acute porphyrias (a blood disorder) or poor kidney function
– People who had nitrofurantoin-induced cholestatic jaundice or liver dysfunction
– People allergic to Nitrofurantoin or any formulation ingredient

Pharmacist Tips:

This drug may cause brown colored urine, it is normal, do not be alarmed.

Common dosing schedule:
Take Nitrofurantoin with food to avoid stomach upset.

This schedule is for reference only, adjustments may be made according to individual needs.

Some common medications Nitrofurantoin may interact with:
Magnesium Trisilicate
– Norfloxacin

Please notify your doctor or pharmacist if you are taking the above medication, dosage adjustments might be needed.

Where to buy Nitrofurantoin in Hong Kong?

In Hong Kong, Nitrofurantoin is an over-the-counter medicine which can be purchased without a prescription from any retail outlet in Hong Kong. This includes grocery stores, convenience stores, medicine shops, and pharmacies. It can also be obtained from doctors. To find a pharmacy near you, refer to the list of pharmacies (“Authorized Sellers of Poisons”) from the Hong Kong Department of Health.

For more information about drug names and ingredients, you can visit Hong Kong’s Drug Office at

Need more information?

For detailed information about the use of Nitrofurantoin in children, pregnancy and breastfeeding, and for questions about drug interactions, please check with your pharmacist or doctor.

Disclaimer: our goal is to provide you with the most relevant drug information and common dosage for Hong Kong. This information does not constitute medical advice. For specific treatment recommendations and advice, always discuss with your doctor or pharmacist, and follow the instructions included with your specific medicine.