Isosorbide mononitrate
Also sold as: Imdur, Monoket
Prescription neededChest pain and heart rhythm
Comes as:TabletCapsule
Usual adult dose
To prevent angina: 20 mg two times a day with the doses given in the daytime only (for example 8 am and 2 pm), or a long-acting tablet 30 to 60 mg once a day in the morning (up to 120 mg). It does not treat a sudden attack.
Your doctor may give you a different dose. Children's doses depend on weight.
Side effects
Common
- headache
- flushing
- dizziness
- nausea
Serious — get help
Stop taking it and see a doctor straight away if you notice:
- fainting
- very low blood pressure
Do not take it, or take care, if
- Taking sildenafil or similar medicines
- Very low blood pressure
- Severe anaemia
- Severe narrowing of the aortic heart valve
Interactions
Medicines that can react with this one.
Serious1 medicineDo not take these together unless your doctor says so.
- Sildenafil
Nitrates with sildenafil can cause a dangerous fall in blood pressure; never combine.