Heart and blood pressure

Why these medicines are long-term and prescription-only

High blood pressure and raised cholesterol produce no symptoms in most people, which is precisely why they are treated: the point of treatment is the stroke, heart attack or kidney damage that does not happen years later. That also means there is no feeling to guide the dose, so the treatment runs on measurement and review rather than on how you feel on a given day.

All of these medicines are prescription-only in Ireland. Each class carries its own interactions and its own monitoring, and several of them are unsafe in pregnancy, so nobody should be starting or stopping one on the basis of a website. What a website can usefully do is explain what your prescriber is balancing, so the conversation at the next review is a better one. Blood pressure targets differ by age, by kidney function, by diabetes and by whether you have already had a cardiovascular event, which is why two people on very different regimens can both be treated correctly.

The main classes and how they differ

Four classes carry most blood pressure treatment. Calcium channel blockers such as amlodipine relax arteries and commonly cause ankle swelling and flushing. ACE inhibitors such as ramipril and angiotensin receptor blockers such as losartan or candesartan act on the same hormonal system, lower blood pressure and protect the kidneys in diabetes, and need kidney function and potassium checked. Beta blockers such as bisoprolol slow the heart and are used particularly after a heart attack, in heart failure and in some rhythm disorders. Thiazide-like diuretics remove salt and water and affect sodium and potassium.

Statins such as atorvastatin and rosuvastatin are a separate matter entirely and do not lower blood pressure; they lower LDL cholesterol to reduce cardiovascular risk. Tamsulosin, which often appears on the same prescription list for older men, treats prostate symptoms and can drop blood pressure on standing. Levothyroxine is not a heart medicine either, but an untreated or over-treated thyroid affects heart rate and rhythm, which is why it turns up in the same conversation.

Why ACE inhibitors cause a cough

The dry, tickly, persistent cough that some people develop on an ACE inhibitor is caused by the drug itself, not by an infection. ACE inhibitors block an enzyme that also breaks down bradykinin and related substances, so these accumulate in the airway and irritate it. The cough is typically dry rather than productive, often worse lying down, and can start weeks or months after the medicine was begun, which is why the connection is so often missed.

It is not dangerous, but it does not settle while the drug continues, and there is no point suppressing it with cough remedies. The standard answer is to switch to an angiotensin receptor blocker, which works on the same system without the bradykinin effect and rarely causes a cough. That switch is a prescriber's decision, so tell whoever manages your blood pressure rather than simply stopping. One thing to take seriously: swelling of the lips, tongue or throat on an ACE inhibitor is angioedema, not a cough, and needs urgent assessment through 112 or 999.

Can I stop a beta blocker

Not abruptly, and not on your own. Stopping a beta blocker suddenly can cause a rebound: a rise in heart rate and blood pressure, palpitations, and in people with coronary disease an increased risk of angina or a cardiac event. If a beta blocker needs to come off, it is reduced in steps over a period decided by the prescriber, and the reason for stopping shapes how quickly that can be done.

The common reasons people want to stop are tiredness, cold hands and feet, slow pulse, vivid dreams and reduced exercise tolerance, and all of them are worth raising because a dose reduction or a different drug often resolves them. Beta blockers also blunt the warning signs of low blood sugar, which matters in insulin-treated diabetes, and can worsen some asthma. None of that changes the rule about stopping: the risk is in the abruptness, not in the decision. Running out of tablets produces the same rebound as choosing to stop, which is why continuity of supply is a clinical issue rather than an administrative one.

Statins, muscle symptoms and the questions people actually ask

Muscle aching is the side effect people have heard about, and it does happen, though studies where neither patient nor doctor knew who was taking the statin found far less difference than the reputation suggests. Genuine statin-related muscle symptoms are usually symmetrical, affect large muscle groups such as thighs and shoulders, and improve within weeks of stopping. Severe, widespread muscle pain with dark urine is rare and needs urgent assessment.

Most muscle symptoms on a statin do not require abandoning treatment. A pause and rechallenge, a lower dose, a different statin or alternate-day dosing solve it for many people. Two practical points come up constantly: grapefruit juice interacts meaningfully with some statins but not all, and statins should be stopped in pregnancy, so anyone planning a pregnancy needs that conversation in advance. Liver enzymes are usually checked before starting and again after a period on treatment, and a modest rise is not automatically a reason to stop.

How often you need checks

Monitoring is what makes long-term treatment safe, and its frequency depends on the drug and on your stability rather than on a single universal rule. Blood pressure is typically reviewed at least annually once it is controlled, and more often after any change of medicine or dose. ACE inhibitors, ARBs and diuretics need kidney function and potassium checked before starting, after a dose change and periodically afterwards. Statins involve a lipid profile and liver enzymes. Levothyroxine runs on thyroid function tests.

Home readings are useful if the machine is a validated upper-arm device and you record readings properly rather than only when you feel odd. A single high reading proves very little; a pattern over a week means something. Illness changes the picture too: dehydration from vomiting or diarrhoea makes ACE inhibitors, ARBs and diuretics riskier for the kidneys, and prescribers often advise pausing them during a significant gastrointestinal illness. Ask what your own rule is before you need it.

Renewing a stable cardiovascular prescription

Where treatment is established, unchanged and monitored, a renewal is a supply question rather than a clinical one, and MEDINOW runs a written repeat prescription assessment for it at 19.90 euro. A doctor reads your questionnaire and answers in writing; there is no video consultation, no phone appointment and no live chat. Have the substance name, strength and dose to hand, plus the date and result of your last blood pressure reading and any recent bloods.

A renewal is declined where the safety of the next prescription depends on information the questionnaire cannot supply: out-of-date kidney function on an ACE inhibitor, ARB or diuretic, a dose in the middle of being changed, new symptoms such as chest pain, breathlessness or blackouts, or a treatment nobody has reviewed as a whole for a long time. In those cases the correct next step is your GP. The fee covers the medical assessment itself, not the issuing of a document. If the doctor declines on medical grounds, the fee is refunded. If you do not send the documentation the doctor asks for, the assessment counts as carried out and the fee is not refunded.

When this is an emergency

Chest pain or tightness, particularly with breathlessness, sweating, nausea or pain spreading to the arm, jaw or back, needs an ambulance rather than a GP appointment: ring 112 or 999 and, unless you are allergic or have been told not to, chew a 300 mg aspirin while waiting. Do not drive yourself.

The stroke signs are worth memorising: face drooping, arm weakness, speech difficulty, time to call 112 or 999. Also urgent are blackouts, a very slow or racing pulse with dizziness, sudden severe breathlessness, and swelling of the lips, tongue or throat on an ACE inhibitor. A very high blood pressure reading with headache, visual disturbance, chest pain or breathlessness needs urgent assessment; a high reading with no symptoms should be repeated calmly after a few minutes of sitting quietly and then discussed with your GP rather than treated as a crisis.

Who wrote this page

This page was written by the MEDINOW editorial team and reviewed by lek. Damian Wojno, a doctor registered in Poland, PWZ no. 3211301. He is not on the Irish Medical Council register. Reviewed on 29 August 2026.

It is general information about classes of cardiovascular medicine and the monitoring behind them. It is not a diagnosis, not advice about your own dose, and not a substitute for the GP or cardiology team who hold your results. Full warnings and contraindications for any individual medicine are in its Summary of Product Characteristics.

How this page was put together: the medicines, categories and rules described here were checked against the sources listed below rather than written from memory, and any figure we could not verify at source was left out instead of estimated. Where Irish practice differs from the rules of another country, the Irish position is the one stated on this page, and the Irish regulators named here are the HPRA for medicines, the HSE for health services, the PSI for pharmacy and the Irish Medical Council for doctors practising in Ireland. Corrections are welcome by email and are made to the page rather than argued about.