1. About sotalol
Sotalol belongs to a group of medicines called beta blockers.
This medicine is only available on prescription. It comes as tablets.
2. Key facts
- Sotalol slows down your heart rate and makes it easier for your heart to pump blood around your body.
- Your very first dose of sotalol may make you feel dizzy, so take it at bedtime. After that, if you don't feel dizzy, you can take it in the morning.
- It's usual to take sotalol either once a day, in the morning - or twice a day, in the morning and evening.
- The main side effects of sotalol are feeling dizzy or sick, feeling tired, having diarrhoea or a headache - these are usually mild and short-lived. You're more likely to have side effects if you're on a very high dose of sotalol.
- Sotalol is also known by the brand names Sotacor and Beta-Cardone.
3. Who can and can't take sotalol
Sotalol can be taken by adults and children over the age of 12 years. It can also be taken by children under the age of 12 on the advice of their specialist.
It isn't suitable for everyone.
To make sure it is safe for you, tell your doctor before starting sotalol if you have:
- had an allergic reaction to sotalol or any other medicine in the past
- low blood pressure or a slow heart rate
- heart failure which is getting worse, heart disease, or you've recently had a heart attack
- any problems with your kidneys
- an overactive thyroid (hyperthyroidism) - sotalol may make it more difficult to recognise the warning signs of having too much thyroid hormone in your body (thyrotoxicosis)
- severe blood circulation problems in your limbs (such as Raynaud's phenomenon), which may make your fingers and toes tingle or turn pale or blue
- metabolic acidosis - when there is too much acid in your blood
- a lung disease or severe asthma
- severe diarrhoea
4. How and when to take it
It's usual to take sotalol once or twice a day.
Your doctor may advise you to take your first dose before bedtime, because it can make you feel dizzy. After the first dose, if you don't feel dizzy, you can take sotalol in the morning.
If you have sotalol twice a day, try to take it in the morning and in the evening.
Take sotalol even if you feel well, as you will still be getting the benefits of the medicine.
How much will I take?
The usual dose of sotalol is between 80mg and 320mg a day. If you experience irregular heartbeats several times a day, your doctor may prescribe a higher daily dose of up to 640mg.
If you are older or have kidney problems, your doctor may give you a lower dose.
How to take it
You can take sotalol with or without food, but it's best to do the same each day.
Swallow the tablets whole with a drink of water. Some brands have a score line to help you break the tablet to make it easier to swallow.
Check the information leaflet for your brand to see if you can do this.
What if I forget to take it?
If you miss a dose of sotalol, take it as soon as you remember, unless it is nearly time for your next dose. In this case, just leave out the missed dose and take your next dose as normal.
Never take 2 doses at the same time. Never take an extra dose to make up for a forgotten one.
If you often forget doses, it may help to set an alarm to remind you. You could also ask your pharmacist for advice on other ways to help you remember to take your medicine.
What if I take too much?
Taking too much sotalol can slow down your heart rate and make it difficult to breathe. It can also cause dizziness and trembling.
The amount of sotalol that can lead to an overdose varies from person to person.
Urgent advice: Call your doctor or go to A&E straight away if you take too much sotalol by accident
If you go to a hospital accident and emergency (A&E) department, do not drive yourself - get someone else to drive you or call for an ambulance.
Take the sotalol packet, or the leaflet inside the packet, plus any remaining medicine with you.
5. Side effects
Like all medicines, sotalol can cause side effects in some people but many people have no side effects or only minor ones. Side effects often improve as your body gets used to the medicine.
Common side effects
These common side effects happen in more than 1 in 100 people. They're usually mild and short-lived.
Talk to your doctor or pharmacist if the side effects bother you or last more than a few days:
- feeling tired, dizzy or weak
- cold hands or feet
- feeling or being sick (nausea or vomiting)
Serious side effects
It happens rarely, but some people have serious side effects when taking sotalol.
Tell a doctor straight away if you have:
- shortness of breath with a cough which gets worse when you exercise (like walking up stairs), swollen ankles or legs, chest pain, an irregular heartbeat - these are signs of heart problems
- shortness of breath, wheezing and tightening of the chest - these can be signs of lung problems
- palpitations, and tingling, numbness or cramping in your arms and legs - these are signs of low potassium or magnesium levels
- feeling very thirsty and sweating a lot for no obvious reason - these can be signs of low or high blood sugar levels (hypoglycaemia or hyperglycaemia)
Serious allergic reaction
In rare cases, sotalol may cause a serious allergic reaction (anayphylaxis).
Immediate action required: Call 999 or go to A&E if:
- you get a skin rash that may include itchy, red, swollen, blistered or peeling skin
- you're wheezing
- you get tightness in the chest or throat
- you have trouble breathing or talking
- your mouth, face, lips, tongue or throat start swelling
You could be having a serious allergic reaction and may need immediate treatment in hospital.
These are not all the side effects of sotalol. For a full list, see the leaflet inside your medicine packet.
You can report any suspected side effect to the UK safety scheme.
6. How to cope with side effects
What to do about:
- headaches - make sure you rest and drink plenty of fluids. Do not drink too much alcohol. Ask your pharmacist to recommend a painkiller. Headaches usually go away after the first week of taking sotalol. Talk to your doctor if the headaches last longer than a week or are severe.
- feeling tired, dizzy or weak - if sotalol makes you feel dizzy or weak, stop what you're doing and sit or lie down until you feel better. Do not drive or use tools or machinery if you're feeling tired. Do not drink alcohol as it will make you feel worse.
- cold hands or feet - put your hands or feet under warm running water, massage them and wiggle your fingers and toes. Do not smoke or have drinks with caffeine in - these can make your blood vessels narrower and restrict your blood flow. Smoking also makes your skin colder. Try wearing mittens (they're warmer than gloves) and warm socks. Do not wear tight watches or bracelets.
- feeling or being sick (vomiting) - stick to simple meals and don't eat rich or spicy food. It might help to take your sotalol after you've eaten. If you're being sick, try small frequent sips of water.
- diarrhoea - drink plenty of water or other fluids. Speak to a pharmacist if you have signs of dehydration, such as peeing less than usual or having dark, strong-smelling pee. Do not take any other medicines to treat diarrhoea without speaking to a pharmacist or doctor.
7. Pregnancy and breastfeeding
Sotalol isn't usually recommended in pregnancy or while breastfeeding.
If you're trying to get pregnant or you're already pregnant, talk to your doctor about the benefits and possible harms of taking sotalol.
Sotalol and breastfeeding
Sotalol passes into breast milk and has been linked with side effects in breastfed babies.
Talk to your doctor, as there are other medicines that might be better while you're breastfeeding.
Non-urgent advice: Tell your doctor if you're:
- trying to get pregnant
8. Cautions with other medicines
There are some medicines that may interfere with the way sotalol works.
Tell your doctor if you're taking:
- medicines that can cause abnormal heart rhythms - these include some antibiotics, like clarithromycin and erythromycin, and some antidepressants, like citalopram and amitripyline
- other medicines used to treat an irregular heartbeat, such as amiodarone
- medicines for high blood pressure, such as diltiazem and verapamil
- medicines that can lower your potassium levels - these include medicines that make you pee, like furosemide, and some steroids, like prednisolone
- medicines for asthma or chronic obstructive pulmonary disease (COPD)
- medicines for allergies, such as ephedrine, noradrenaline or adrenaline
Mixing sotalol with herbal remedies or supplements
There's very little information about taking herbal remedies and supplements with sotalol.
For safety, tell your doctor or pharmacist if you're taking any other medicines, including herbal medicines, vitamins or supplements.
9. Common questions
How does sotalol work?
How long does sotalol take to work?
How long will I take it for?
Is it safe to take for a long time?
What will happen if I stop taking it?
How does it compare with other heart medicines?
Will I need to stop sotalol before surgery?
Can I drink alcohol with it?
Is there any food or drink I need to avoid?
Will it affect my contraception?
Will it affect my fertility?
Will it affect my sex life?
Do I need to avoid playing sports?
Can I drive or ride a bike?
Can lifestyle changes help?
Page last reviewed: 17/08/2018
Next review due: 17/08/2021