Skip to content
PIL Logo

Monomax SR 40 & 60mg Prolonged Release Capsules

Last Updated on eMC 10-Aug-2015 View changes  | Chiesi Limited Contact details

The Patient Information Leaflet (PIL) is the leaflet included in the pack with a medicine. It is written for patients and gives information about taking or using a medicine. It is possible that the leaflet in your medicine pack may differ from this version because it may have been updated since your medicine was packaged.

Please click on the link to the left to view the PIL in PDF format.

Text only version for the visually impaired
Below is a text only representation of the Patient Information leaflet. The original may contain images or tables and can be viewed in PDF format using the link to the left. This PIL may be available from the RNIB in large print, Braille or audio CD. For further information please call the RNIB Medicine Leaflet line on 0800 198 5000. The product code(s) for this leaflet is/are: PL 08829/0030, PL 08829/0029.

Monomax SR 40 & 60mg Prolonged Release Capsules


Monomax® SR 40 mg & 60 mg Capsules

Isosorbide Mononitrate

Read all of this leaflet carefully before you start taking this medicine because it contains important information for you.

  • Keep this leaflet. You may need to read it again.
  • If you have any further questions, ask your doctor or pharmacist.
  • This medicine has been prescribed for you only. Do not pass it on to others. It may harm them, even if their signs of illness are the same as yours.
  • If you get any side effects, talk to your doctor or pharmacist. This includes any possible side effects not listed in this leaflet. See section 4.

What is in this leaflet:

1. What Monomax is and what it is used for
2. What you need to know before you take Monomax
3. How to take Monomax
4. Possible side effects
5. How to store Monomax
6. Contents of the pack and other information

1. What Monomax is and what it is used for

Monomax SR Modified-release Capsules contain isosorbide mononitrate which belongs to a group of medicines called nitrates that act on the cardiovascular system (the heart and blood vessels). Monomax has been given to you by your doctor or pharmacist to reduce the frequency of your anginal attacks (chest pains). They are called modified-release capsules because they are manufactured in a way that allows the isosorbide mononitrate to be released and slowly absorbed by your body over a period of several hours.

In angina, isosorbide mononitrate works by opening up the arteries supplying the heart muscle and this allows more blood and oxygen to reach the muscle, decreasing the chances of angina (chest pains) occurring when extra strain is placed upon the heart.

2. What you need to know before you take Monomax

Do not take Monomax:

  • if you are taking the drug sildenafil, for the treatment of male erectile dysfunction (see also: Section 2 - taking other medicines)
  • if you are allergic to isosorbide mononitrate, other nitrates (e.g glyceryl trinitrate or isosorbide dinitrate) or any of the other ingredients in Monomax
  • if you have suffered a stroke or have any other condition which may affect the blood supply to your brain
  • if you suffer from low blood pressure
  • if you suffer from a reduction in red blood cells which can make the skin pale and cause weakness and breathlessness
  • if you have been told that you have a problem with your heart. Ask your doctor if you are not sure if this applies to you
  • to treat an angina attack as it occurs. Your doctor will probably have given you another tablet to take for sudden attacks.

Take special care with Monomax and always tell your doctor or pharmacist if:

  • you suffer from increased pressure in your eyes
  • you suffer from an underactive thyroid gland
  • you suffer from an abnormally low body temperature
  • you suffer from poor health caused by a poor diet
  • you suffer from severe liver or kidney disease
  • you have been told that you have a narrowing of the valves in your heart
  • you become dizzy, light headed or faint when you stand up
  • you have suffered from a head injury or bleeding in the brain.

Taking other medicines

Before starting treatment, please tell your doctor or pharmacist if you are taking or have recently taken any other medicines, including medicines obtained without a prescription. If you have to go to a doctor, dentist or hospital for any reason, tell them that you are taking Monomax.

In particular, tell your doctor or pharmacist if you are taking:

  • medicines for the treatment of high blood pressure, such as hydralazine or minoxidil
  • medicines to treat the symptoms of depression, such as amitriptyline or imipramine
  • medicines to treat a mental condition, such as chlorpromazine or methotrimeprazine
  • water tablets, such as frusemide

Taking these types of medicines with Monomax can increase the risk of low blood pressure occurring, especially if you are elderly.

Do not take sildenafil, used for the treatment of erectile dysfunction at the same time as Monomax. If taken at the same time it could cause a severe fall in blood pressure resulting in collapse, unconciousness and may be fatal.

Taking Monomax with alcohol

Do not take Monomax at the same time as an alcoholic drink.

Pregnancy, breast-feeding and fertility:

Do not take Monomax if you are pregnant, trying to become pregnant or are breast-feeding.

Driving and using machines:

If you feel faint, dizzy or light headed when you stand up or move suddenly after taking Monomax, then do not drive or operate machinery.

Important information about some of the ingredients of Monomax:

Monomax contains lactose monohydrate and sucrose. If you have been told by your doctor that you have an intolerance to some sugars, contact your doctor before taking this medicinal product.

3. How to take Monomax

Always take Monomax exactly as your doctor or pharmacist has told you to. You should check with your doctor or pharmacist if you are not sure.

The label on the carton will tell you how many capsules you should take and when. It is very important that you take your capsules regularly. Do not stop treatment even if you feel better unless told to do so by your doctor.

Monomax is formulated so that you only have to take your capsules once a day. It is important that you take your capsules at the same time each day, preferably in the morning. Your capsule must be swallowed whole with a glass of water. Do not break or chew your capsules.

Adults and the elderly: the usual dose is 40 mg or 60 mg once a day. Your doctor may decide to increase your dose to a maximum of 120 mg of Monomax once a day.

If you are elderly and suffer from low blood pressure, liver or kidney disease, your doctor may prescribe a lower dose for you to take.

Do not stop taking your medicine until your doctor tells you.

Children must not take this medicine.

If you take more Monomax than you should

If you accidentally take more Monomax than you should, contact your nearest casualty department or tell your doctor or pharmacist immediately. Remember to take the pack and any remaining capsules with you.

If you forget to take Monomax

Do not worry. Simply leave out that dose completely and then take your next dose at the right time. Do not take a double dose to make up for a missed dose.

If you have any further questions on the use of this product, ask your doctor or pharmacist.

4. Possible side effects

Like all medicines, Monomax can cause side effects, although not everyone gets them.

If you experience a headache when you first start taking your capsules, contact your doctor or pharmacist immediately. Your doctor or pharmacist may need to adjust your dose.

The following side effects do not usually last long and are most likely to occur when you first start to take your medicine or if your dose has been increased. If they continue or if you are worried, contact your doctor or pharmacist immediately:

  • light headedness when you stand up or move suddenly
  • faintness

Also, some people experience:

  • flushing
  • dry skin rashes
  • dizziness
  • feeling sick
  • itchy skin

If any of the side effects get serious, or if you notice any side effects not listed in this leaflet, please tell your doctor or pharmacist.

Reporting of side effects

If you get any side effects talk to your doctor, pharmacist, or nurse. This includes any possible side effects not listed in this leaflet. You can also report side effects directly via the YellowCard Scheme at By reporting side effects you can help provide more information on the safety of this medicine.

5. How to store Monomax

  • Keep this medicine out of the sight and reach of children.
  • Do not store above 25°C. Store in the original packaging.
  • Do not use Monomax after the expiry date which is stated on the blister and carton. The expiry date refers to the last day of that month.
  • Medicines should not be disposed of via wastewater or household waste. Ask your pharmacist how to dispose of medicines no longer required. These measures will help protect the environment.

6. Contents of the pack and other information

What Monomax contains:

  • The active substance in your capsules is isosorbide mononitrate. Each capsule contains 40 mg or 60 mg of isosorbide mononitrate.
  • The other ingredients are lactose monohydrate, sucrose, maize starch, shellac (E904), talc, copolymer of methacrylic acid and methyl methacrylate and copolymer of ethyl acrylate, methyl methacrylate, trimethylammonioethyl methacrylate chloride, gelatine, titanium dioxide (E171) and iron oxide (E172).

What Monomax looks like and the contents of the pack:

Monomax SR 40 mg and 60 mg Modified-release Capsules are white with “ISMN SR” and “40” or “60” printed on the capsule in black ink respectively. They are available in blister packs of 28 capsules.

Marketing Authorisation Holder and Manufacturer:

The Marketing Authorisation holder and manufacturer is:

Chiesi Limited
333 Styal Road
M22 5LG

Is this leaflet hard to see or read? Phone 0161 488 5555 for help.

This leaflet was last approved in 07/2015

FR01811.V4 / CP0028/5

Company contact details

Chiesi Limited

Company image

Chiesi Limited, 333 Styal Road, Manchester, M22 5LG


0800 009 2329


+44 (0) 161 488 5555

Medical Information e-mail

Before you contact this company: often several companies will market medicines with the same active ingredient. Please check that this is the correct company before contacting them. Why?

Active ingredients

isosorbide mononitrate

Legal categories

P - Pharmacy

This site uses cookies. By continuing to browse the site you are agreeing to our policy on the use of cookies. Continue