MacroBID
Use MacroBID to treat your urinary tract infection in 3 days. MacroBID is an effective antibiotic you can request from Asda Online Doctor.




Prices from £24.00
In stock. Simply fill in a brief questionnaire. One of our doctors will review your order and prescribe a suitable treatment. How to Order
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MacroBID contains the antibiotic nitrofurantoin to treat urinary tract infections (UTIs) like cystitis. Each MacroBID capsule contains 100mg of the active ingredient nitrofurantoin.
MacroBID is made by Famar A.V.E. and a treatment course is 1 capsule twice a day for 3 days.
You can request MacroBID from Asda Online Doctor today. Fill in a short online questionnaire that one of our doctors will review. If MacroBID is right for you, we will deliver a pack to your door. You can also choose to collect from a nearby Asda Pharmacy.




About MacroBID
How to take MacroBID
To take MacroBID, swallow 1 capsule twice a day after you’ve had some food or with a glass of milk. This will help you absorb MacroBID better and stop you from feeling sick. You should not crush or chew MacroBID capsules.
Your doctor will recommend if you need to take MacroBID for 3 days or longer, depending on your infection.
If you take more MacroBID than you should, go to a doctor or the nearest hospital. Take your pack of MacroBID with you.
If you miss a capsule of MacroBID, take it as soon as you remember. Do not take 2 capsules of MacroBID at the same time. It’s better to skip the dose you missed and take your next dose at the time it’s due.
Make sure you take all of your MacroBID capsules and complete the full treatment course, even if you’re feeling better.
Contact a healthcare professional whenever you have any questions.
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MacroBID is an antibiotic known also as nitrofurantoin. You can use MacroBID to help clear bladder infections caused by bacteria.
If MacroBID does not clear up your infection after 3 days, you’ll need to speak to a doctor for advice on what to do next.
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As an antibiotic, MacroBID works by killing bacterial infections in your bladder area. This stops the burning sensation you have when you pee, and prevents your infection from getting worse. The sooner you use MacroBID, the faster you can get back to your normal daily activities.
You can request MacroBID today from Asda Online Pharmacy.
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You can take MacroBID if you are not allergic to nitrofurantoin or any other ingredients in the capsules.
Do not take MacroBID if you:
- are allergic to nitrofurantoin or similar antibiotics
- have kidney disease
- are in your last few weeks of pregnancy
- have G6PD (glucose-6-phosphate dehydrogenase) deficiency
- are breastfeeding a baby, as it can get into your breast milk
- are under 12 years old
If you have any of these medical conditions, talk to your doctor before taking MacroBID:
- diabetes
- problems with your nerves (like peripheral neuropathy)
- vitamin B deficiency
- anaemia
- a history of allergies
- dark urine
- liver disease
For more information, look at the patient information leaflet in your pack of MacroBID. You can also speak to a doctor to check if MacroBID is the right choice for you.
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Yes, there are generic versions of MacroBID. MacroBID is a brand name for the generic medicine nitrofurantoin. With MacroBID, you usually take 1 tablet twice a day. But with generic nitrofurantoin, or macrodantin, you would need to take 1 tablet four times a day.
There are alternative antibiotics that help treat urinary tract infections.
These other antibiotics include:
- trimethoprim in combination with sulfamethoxazole (Bactrim, Septra)
- fosfomycin (Monurol)
- cephalexin (Keflex)
If you’re unsure what you need, fill out a form with Asda Online Doctor and we can help find the right antibiotic for you.
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You can get side effects after you take MacroBID, but these are usually short-lived.
Common side effects of MacroBID include:
- dark yellow or brown urine
- diarrhoea
- nausea
- headache
- drowsiness
If you experience any of the serious side effects below, stop taking MacroBID and call 999:
- signs of an allergic reaction like shortness of breath, swelling of the face and itching
- loss of appetite
- abdominal pain
- yellowing of the skin, also known as jaundice which is a sign of hepatitis
- stomach pain or chest pain
- blood in your stools
MacroBID may interact with other medicines you might be taking. This can affect how MacroBID or the other medicines work. This includes medicines used for:
- indigestion, like antacids or magnesium trisilicate
- gout, like probenecid or sulfinpyrazone
- glaucoma, like acetazolamide
- changing how acidic your urine is, like potassium citrate.
- infections, like quinolones
- disease prevention, like typhoid vaccine
Further drug information can be found on the patient information leaflet for MacroBID.
You can report side effects using the MHRA Yellow Card Scheme online or in the Google Play or Apple App Store.
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What active ingredients are in MacroBID?
The active ingredient in MacroBID is nitrofurantoin. Each capsule of MacroBID contains 100mg of nitrofurantoin.
Other ingredients in MacroBID include talc, corn starch, lactose, carbopol, povidone, sugar and magnesium stearate.
The capsule shell contains gelatin, quinoline yellow (E104), titanium dioxide (E171) and FD&C Blue No.2 (E132).
The printing ink is made from shellac, propylene glycol (E1520), titanium dioxide (E171) black iron oxide (E172), ammonium hydroxide (E527) and simethicone.
MacroBID is not suitable for vegans as it contains lactose and gelatin.
How should MacroBID be disposed of?
Dispose of MacroBID by returning it to your local pharmacy. Do not throw away MacroBID in your bin at home.
How should MacroBID be stored?
Store MacroBID at less than 25°C or at room temperature. If you keep MacroBID in its original box, you protect the capsules from light and water. Keep MacroBID away from children and pets.
What does MacroBID look like?
MacroBID capsules are half blue and half yellow capsules with ‘GS 100’ written on them. Each MacroBID box has a blister strip with 6 capsules.
In which pack sizes is MacroBID available?
MacroBID comes in a pack size of 6 capsules.
Information on the manufacturer
The marketing authorisation holder for MacroBID is Mercury Pharmaceuticals Ltd, Capital House, 85 King William Street, London EC4N 7BL, UK.
The manufacturer of MacroBID is Famar A.V.E., 7 Anthousa Avenue, 15344 Anthousa, Attiki, Greece.

Dr Kathryn Basford is a qualified GP who works as a GP in London, as well as with ZAVA. She graduated from the University of Manchester and completed her GP training through Whipps Cross Hospital in London.
Meet our doctorsArticle created: 08 Oct 2021
Last reviewed: 08 Oct 2021
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https://www.medicines.org.uk/emc/files/pil.429.pdf [February 2019] [accessed August 2021]
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https://www.medicines.org.uk/emc/product/429/smpc#gref [March 2019] [accessed August 2021]


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