Living With Blood Pressure Tablets: The Common Side Effects, What Fixes Each One, and the Rules for Sick Days
💊 Blood pressure tablets are among the most prescribed medicines in the world, and most people take them for decades. They prevent strokes, heart attacks and kidney failure — but only while they are taken. 📉 Around half of people stop or skip their tablets within the first year, and the usual reason is not forgetfulness. It is a side effect that nobody explained: a dry cough, puffy ankles, dizziness on standing, a trip to the toilet every hour. 🔧 Almost every one of these has a simple fix, usually a change of dose, timing or drug class rather than giving up treatment. This guide goes through them one by one, then covers timing, missed doses, interactions and the rules for days when you are ill.
🧭 The main tablet groups, and their typical side effects
🔎 There are five main families of blood pressure medicine. Each family has its own signature side effect, so knowing which family your tablet belongs to tells you most of what to expect. 📋 The name on the box often hides the family, which is why the table below gives both.
| 💊 Family | 🏷️ Examples | ⚠️ Signature side effect |
|---|---|---|
| 💨 ACE inhibitors (names end in -pril) | Zestril (Lisinopril), Altace (Ramipril), Vasotec (Enalapril) | Dry, tickly cough; rarely, swelling of lips or tongue |
| 🛡️ ARBs (names end in -sartan) | Cozaar (Losartan), Micardis (Telmisartan), Diovan (Valsartan) | Very few; dizziness at first, raised potassium |
| 🦶 Calcium channel blockers | Norvasc (Amlodipine), Adalat (Nifedipine), Cardizem (Diltiazem) | Swollen ankles, flushing, headache |
| 💧 Diuretics | Lozol (Indapamide), Microzide (Hydrochlorothiazide) | Passing more urine, low sodium or potassium, gout |
| 💓 Beta blockers | Zebeta (Bisoprolol), Toprol XL (Metoprolol), Coreg (Carvedilol) | Tiredness, cold hands, vivid dreams |
📖 Which family suits which person, and target numbers, are covered in arterial hypertension: the right numbers and the right first drugs. This article picks up after the prescription.
📊 Side effects at a glance, family by family
👁️ A quick way to compare: the more dots, the more often that problem turns up with that family. No family is free of side effects, but ARBs come closest, which is why they are the usual switch when another family is not tolerated.
| 💊 Family | 😵 Dizziness | 🤧 Cough | 🦶 Ankles | 😴 Tiredness |
|---|---|---|---|---|
| ACE inhibitors | ●●●● | ●●●● | ●●●● | ●●●● |
| ARBs | ●●●● | ●●●● | ●●●● | ●●●● |
| Calcium channel blockers | ●●●● | ●●●● | ●●●● | ●●●● |
| Diuretics | ●●●● | ●●●● | ●●●● | ●●●● |
| Beta blockers | ●●●● | ●●●● | ●●●● | ●●●● |
📌 Dots show how often the problem is typical for the family, not your personal risk. Many people have none of these effects on any tablet.
🤧 The ACE inhibitor cough
🔍 The cough is dry, tickly and often worse lying down. It is not a sign of lung damage: ACE inhibitors stop the breakdown of a substance called bradykinin, which builds up and irritates the cough reflex. It can begin within days or only after months on the tablet, which is why many people never connect the two.
🔄 The cough does not respond to cough medicine and does not wear off with time. The fix is to switch from the ACE inhibitor to an ARB, which lowers blood pressure in a similar way without the bradykinin effect. The cough then fades over 1 to 4 weeks, occasionally up to 3 months.
🚨 Swelling of the lips, tongue or throat is an emergency.
🔹 Angioedema is a rare reaction to ACE inhibitors, more common in people of African origin. It can start after years on the tablet.
🔹 Call emergency services if swelling affects the tongue or throat, or breathing or swallowing is difficult.
🔹 After angioedema, never restart any ACE inhibitor. ARBs are used only with specialist advice.
🦶 Swollen ankles on amlodipine and similar tablets
💧 Calcium channel blockers such as amlodipine widen the small arteries more than the veins. Fluid is pushed out into the tissues of the ankles and lower legs, especially by evening and in hot weather. It is not heart failure and it is not fluid overload, so water tablets help it very little.
✅ What helps
📉 A lower dose, with a second tablet from another family
🛡️ Adding an ACE inhibitor or ARB, as in combination tablets
🦵 Raising the legs in the evening, and walking
🔄 A switch to a different calcium channel blocker or another family
❌ What does not help
💧 Water tablets for this kind of swelling
🧂 Cutting fluid intake, which only dehydrates
⏳ Waiting for it to wear off; it usually stays
🚫 Stopping without a plan, leaving pressure untreated
⚠️ Swelling in one leg only, with pain or redness, or swelling with breathlessness, is not a tablet side effect until proven otherwise. Get it checked the same day.
😵 Dizziness on standing
🧍 In the first weeks of treatment, or after a dose increase, many people feel lightheaded when they stand up quickly. The body is adjusting to a lower pressure, and this usually settles within two to four weeks. In older people, or with several tablets, it can persist and lead to falls.
💧 Diuretics: the toilet, salts and gout
🚽 Diuretics, often called water tablets, lower pressure by making the kidneys remove more salt. The extra urine is greatest in the first few hours after the dose, which is why they are taken in the morning. Modern low doses of indapamide or hydrochlorothiazide cause much less of this than older high doses.
| ⚠️ Effect | 📝 Signs, and what helps |
|---|---|
| 🧂 Low sodium | Headache, confusion, nausea, unsteadiness. Most common in older women on indapamide or thiazides. A blood test within weeks of starting |
| 🍌 Low potassium | Cramps, weakness, palpitations. Often avoided by pairing with an ACE inhibitor or ARB |
| 🦶 Gout | Diuretics raise uric acid. A first gout attack on a diuretic is a reason to switch family |
| 🩸 Blood sugar | A small rise, usually without clinical importance at low doses. Checked yearly |
| 🍞 Spironolactone specifics | Aldactone (Spironolactone) can raise potassium and, in men, cause breast tenderness or swelling |
💓 Beta blockers: tiredness and cold hands
🐢 Beta blockers slow the heart and blunt adrenaline. Tiredness, cold fingers, vivid dreams and reduced exercise capacity are their typical effects. For high blood pressure alone they are now a second-line choice; their main uses are angina, after a heart attack, heart failure and fast heart rhythms.
✅ Do
🌙 Try the evening dose if tiredness is worst in the day
🔄 Ask about bisoprolol or nebivolol, which tend to cause less tiredness
💬 Mention breathlessness or wheeze, especially with asthma
❌ Do not
⛔ Stop suddenly. The heart can react with chest pain or a fast pulse
🚫 Use them as a first choice for uncomplicated high blood pressure
❄️ Ignore white, painful fingers in the cold
💏 Erections, libido and blood pressure tablets
🤔 Many men stop their tablets quietly because of erection problems. High blood pressure itself damages the arteries that supply an erection, so the problem is often there before treatment. Some tablets add to it; others do not.
- 🟢 ARBs and ACE inhibitors — neutral, and ARBs may slightly improve erectile function
- 🟢 Calcium channel blockers — generally neutral
- 🟡 Thiazide diuretics — linked to erection problems in some men
- 🟡 Older beta blockers such as atenolol and propranolol — more often implicated; nebivolol much less
- 💊 Erection tablets such as sildenafil are safe with most blood pressure medicines, but never with nitrates, and with care alongside alpha blockers such as doxazosin
🗓️ Starting a new tablet: the first three months
📏 How to measure properly at home, and which numbers count, is in arterial hypertension: how to measure it properly.
🧪 Potassium and kidney blood tests
🩸 ACE inhibitors, ARBs and spironolactone make the kidneys hold on to potassium. A modest rise is normal and expected, and so is a small rise in creatinine, the kidney marker, of up to about 30% after starting. Bigger changes mean a dose review.
low
normal
high, review
urgent
⏰ Morning or evening: does the time matter?
📊 For years, taking tablets at bedtime was promoted as better for the heart. A large UK trial of over 21,000 people, published in 2022, found no difference in heart attacks, strokes or deaths between morning and evening dosing. What matters is taking it at the same time every day, at the time you are least likely to forget.
😬 Missed a dose?
- ⏰ Remembered the same day — take it as soon as you remember, then carry on as normal the next day
- 📅 Remembered the next day — skip the missed dose and take today’s at the usual time. Never double up, which can cause a sharp drop
- ⚠️ Beta blockers and clonidine are the exceptions to treat with care: missing several days in a row can cause a rebound rise in pulse or pressure. Restart and tell your doctor
🤒 Sick-day rules: when to pause tablets
💧 When you are vomiting, have diarrhoea or a high fever and cannot keep fluids down, some tablets can push dehydrated kidneys into injury. Many health services give patients a simple set of “sick-day rules”. Check your own list with your doctor, as it depends on your conditions.
🔗 Medicines and foods that interfere
| 🔗 Interaction | 📝 What happens, and what to do |
|---|---|
| 💊 Ibuprofen, naproxen, diclofenac | Raise blood pressure and, with an ACE inhibitor or ARB plus a diuretic, can injure the kidneys. Paracetamol is preferred |
| 🤧 Decongestants (pseudoephedrine, phenylephrine) | Raise pressure. Use a saline or steroid nose spray instead |
| 🍊 Grapefruit | Raises levels of felodipine and nifedipine markedly; amlodipine much less. Avoid with the first two |
| 🧂 Potassium supplements and salt substitutes | With ACE inhibitors, ARBs or spironolactone, potassium can rise dangerously |
| 🌿 Liquorice | Large amounts raise blood pressure and lower potassium |
| ⚡ Stimulants | Some ADHD and wakefulness medicines raise pulse and pressure. See modafinil and blood pressure medications |
🍷 Alcohol, heat and exercise
🍺 Regular drinking above about 14 units a week raises blood pressure on its own, enough to undo a tablet. A single drink with tablets can also make dizziness worse, particularly with alpha blockers and diuretics.
Drink more; pressure often falls in summer. Review the dose if readings drop
Safe and helpful. Cool down slowly to avoid dizziness after
Can drop pressure sharply. Stand up slowly
Tablets in hand luggage, and keep to home time across a few time zones
🤱 Pregnancy and planning a family
⚠️ ACE inhibitors and ARBs must not be used in pregnancy.
🔹 They can harm the baby’s kidneys, mainly from the second trimester onward.
🔹 Planning a pregnancy: switch before conceiving, usually to labetalol, nifedipine or methyldopa, such as Adalat (Nifedipine).
🔹 Pregnant unexpectedly: do not stop on your own. Contact your doctor within days for a switch.
🕰️ Older adults: getting the balance right
🧓 In people over 80, or who are frail, the balance shifts. Falls from low pressure can do more harm than a slightly higher reading, so targets are often a little higher and tablets are reviewed at every visit. A standing blood pressure check is particularly useful.
❤️ Robert Hayes, MD, FACC, on the patient who stopped their tablets
Most people who stop blood pressure tablets do it for a reason they never tell me: the cough that keeps their partner awake, the ankles that will not fit into shoes, the trip to the toilet in the middle of a meeting. Every one of those has a fix, often within a single visit. I would far rather hear “I hate this tablet” than find out six months later that it went in the bin. With five families and dozens of drugs to choose from, there is almost always one that a person can live with.
🗿 Five beliefs that cause trouble
| 💭 The belief | ✔️ What is actually the case |
|---|---|
| “My pressure is normal now, so I can stop.” | It is normal because of the tablet. It usually rises again within weeks |
| “I will take it only when I feel it.” | High pressure rarely causes symptoms. Feeling fine tells you nothing |
| “The cough will pass.” | The ACE inhibitor cough does not wear off. A switch fixes it |
| “Water tablets will sort my swollen ankles.” | Not when amlodipine is the cause. A lower dose or an added ARB works better |
| “Natural remedies can replace tablets.” | Diet, salt and exercise help a lot, often by 5 to 10 points. Most people still need a tablet |
🚨 When to get help, and how fast
| ⏱️ How fast | 📝 Situation |
|---|---|
| 🔴 Now | Swelling of the lips, tongue or throat · chest pain · fainting · sudden weakness, speech problems or face drooping · reading above 180/120 with headache, chest pain or blurred vision |
| 🟡 Within days | Dizziness that does not settle · muscle weakness or palpitations · swelling of one leg · first gout attack · pregnancy on an ACE inhibitor or ARB |
| 🟢 At the next review | Cough · ankle swelling · tiredness · erection problems · home readings above target for two weeks |
❓ Frequently asked questions
Why does lisinopril make me cough?
ACE inhibitors such as lisinopril raise a substance called bradykinin, which irritates the cough reflex. Switching to an ARB such as losartan usually stops it within weeks.
Why does amlodipine cause swollen ankles?
It widens small arteries more than veins, so fluid seeps into the ankles. A lower dose or adding an ACE inhibitor or ARB helps more than water tablets.
Should I take blood pressure tablets in the morning or at night?
A large trial found no difference in outcomes. Take them at the same time every day; diuretics are best in the morning.
What should I do if I miss a dose?
Take it the same day if you remember. If it is the next day, skip it and continue as normal. Never take a double dose.
What are sick-day rules for blood pressure tablets?
If you cannot keep fluids down, pause ACE inhibitors, ARBs and diuretics, and restart 24 to 48 hours after eating and drinking normally.
Can I take ibuprofen with blood pressure tablets?
It is best avoided. Ibuprofen raises blood pressure and can harm the kidneys with these tablets. Paracetamol is preferred.
Why do I feel dizzy when I stand up?
The body is adjusting to lower pressure, usually for 2 to 4 weeks. If it continues, ask for a dose review and a standing blood pressure check.
Do blood pressure tablets cause erection problems?
Some can, mainly older beta blockers and thiazide diuretics. ARBs, ACE inhibitors and calcium channel blockers are generally neutral.
Can I use salt substitutes with lisinopril or losartan?
Many salt substitutes contain potassium, which can rise too high with these tablets. Ask your doctor before using them.
Can I stop my tablets if my pressure is normal?
Not on your own. The pressure is normal because of the tablet, and it usually rises again within weeks of stopping.
📑 Sources and editorial
- 📘 European Society of Cardiology and European Society of Hypertension guidelines, and the ACC/AHA high blood pressure guideline
- 📊 Systematic reviews of adherence and discontinuation of antihypertensive treatment
- 🤧 Reviews of ACE inhibitor cough and angioedema, and comparisons with angiotensin receptor blockers
- 🦶 Meta-analyses of calcium channel blocker peripheral oedema and its reduction with renin-angiotensin blockers
- 💧 Studies of thiazide-associated hyponatraemia, hypokalaemia and gout
- ⏰ The TIME trial of morning versus evening dosing of antihypertensives (Lancet, 2022)
- 🤒 National guidance on sick-day medicine rules and acute kidney injury prevention
- 🔗 Reviews of NSAID interactions with antihypertensives and the combined risk to the kidneys
- 💏 Reviews of antihypertensive drugs and erectile function
- 🤱 Guidance on hypertension in pregnancy
- 📖 Related reading: the right numbers and the right first drugs, how to measure blood pressure properly, after a heart attack or stent
- 🛒 Related products: Norvasc (Amlodipine), Cozaar (Losartan), Zestril (Lisinopril), Micardis (Telmisartan), Lozol (Indapamide), Zebeta (Bisoprolol)
- 🩺 RXshop Editorial Team — reviewed by Robert Hayes, MD, FACC — Cardiologist
Medical Disclaimer: The information in this article is for educational and informational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek guidance from a qualified healthcare provider with any questions you may have regarding a medical condition, and before starting, stopping or changing any medication.