atenolol vs clonidine
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Side-by-side comparison of atenolol and clonidine. Data from FDA drug databases (Orange Book, NDC Directory, recalls, shortages) covering 20,000+ approved drugs, plus CMS pricing; see our methodology.
minor Known Drug Interaction
Beta-blockers may exacerbate the rebound hypertension which can follow the withdrawal of clonidine. If the two drugs are coadministered, the beta-blocker should be withdrawn several days before the gradual withdrawal of clonidine. If replacing clonidine by beta-blocker therapy, the introduction of beta-blockers should be delayed for several days after clonidine administration has stopped.
Atenolol is a medicine that lowers blood pressure. It can also help with chest pain and after a heart attack.
Clonidine (Catapres) is a medicine used to treat high blood pressure. It can be used alone or with other blood pressure medicines.
Atenolol is used to treat high blood pressure (hypertension). Lowering blood pressure reduces the risk of strokes and heart attacks. Atenolol is also used long-term for chest pain (angina) caused by narrowed arteries. It can also help people who have had a heart attack.
Clonidine is used to treat high blood pressure. High blood pressure can lead to heart disease, stroke, and kidney problems. This medicine helps to lower your blood pressure to a safer level.
Atenolol is a beta-blocker that mainly affects the heart. It works by blocking the effects of certain chemicals in your body that raise heart rate and blood pressure. This helps your heart beat slower and with less force, lowering blood pressure.
Clonidine works in the brain to lower blood pressure. It tells your blood vessels to relax and widen. This makes it easier for blood to flow through your body, which lowers blood pressure.
- • Dizziness
- • Tiredness
- • Fatigue
- • Diarrhea
- • Nausea
- • Dry mouth (occurs in about 40 out of 100 people)
- • Drowsiness (occurs in about 33 out of 100 people)
- • Dizziness (occurs in about 16 out of 100 people)
- • Constipation (occurs in about 10 out of 100 people)
- • Feeling sleepy or sedated (occurs in about 10 out of 100 people)
- Nausea 7,813
- Fatigue 7,573
- Diarrhoea 6,999
- Dyspnoea 6,276
- Dizziness 6,246
- Pain 3,038
- Fatigue 2,925
- Nausea 2,920
- Headache 2,798
- Hypertension 2,595
You should not take atenolol if you have a very slow heart rate, a serious heart block, cardiogenic shock, or heart failure. Atenolol can make these conditions worse. Tell your doctor right away if you feel dizzy or lightheaded, or if your heart rate becomes very slow.
If you suddenly stop taking clonidine, your blood pressure may increase. This can cause serious problems. Talk to your doctor before stopping this medicine.
Tell your doctor if you are pregnant or plan to become pregnant. It is not known if atenolol will harm your unborn baby. Talk to your doctor about the risks and benefits of taking atenolol while pregnant or breastfeeding.
Tell your doctor if you are pregnant or plan to become pregnant. It is not known if clonidine will harm your unborn baby. Talk to your doctor if you are breastfeeding.
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How to Read This atenolol vs clonidine Comparison
atenolol is classified in the Beta-1 Selective Blocker drug class, while clonidine sits within the Central Alpha-2 Agonist class. Drugs from different classes work through distinct mechanisms, so a head-to-head comparison illustrates trade-offs rather than equivalence. Both drugs are prescription-only, so a licensed provider must authorize use.
Adverse event totals above are pulled from the FDA's Adverse Event Reporting System (FAERS). For these top-ranked reactions alone, atenolol has 34,907 submissions while clonidine has 14,276. Those figures reflect cumulative reporting volume, not per-patient risk, so older, widely dispensed drugs typically look worse on count alone. These two drugs have a known minor interaction flagged in FDA labeling, attributed to stopping clonidine can cause a sudden, dangerous rise in blood pressure, and taking a beta-blocker can make this reaction even worse.. Serious warnings, pregnancy guidance, and contraindications can differ even when indications overlap.
A table cannot represent individual circumstances. Data here is sourced from FDA Structured Product Labels (SPL) and FAERS, both of which update as manufacturers and clinicians submit new information. This registry does not provide medical, treatment, substitution, or medication-change directions for atenolol or clonidine.
Registry boundary: This comparison displays source-record fields and does not provide individualized medical direction.