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It is important to understand the safety precautions and potential risks associated with the use of this medication. Ensure you discuss any concerns with your healthcare provider.

• Do not discontinue the medication abruptly: Stopping this drug suddenly may worsen conditions such as chest pain, heart attack, or irregular heartbeat. Consult your doctor if you need to stop using this medication; they will guide you on how to gradually reduce your dosage over 1 to 2 weeks. During this period, limit physical activity to reduce heart strain. Seek immediate medical help if you experience chest pain, pressure, pain radiating to the jaw, neck, or arm, unusual sweating, difficulty breathing, or a rapid or irregular heartbeat.

• Heart failure risk: Atenolol (Tenormin) may exacerbate or cause heart failure, especially in individuals with pre-existing heart conditions. It can slow the heart rate, potentially leading to heart failure if symptoms are not well-managed. Consult your provider if there is a history of heart failure, and inform them promptly if you encounter symptoms like trouble breathing, fatigue, swelling, or sudden weight gain.

• Breathing difficulties: Although rare, atenolol can tighten lung vessels, complicating breathing, particularly in those with asthma or COPD. Share your complete medical history with your provider, who will start you on the lowest effective dose.

• Surgical considerations: If you are scheduled for major surgery with anesthesia, inform your surgeon about your atenolol use. Beta-blockers may increase anesthesia-related risks, necessitating close heart monitoring.

• Low blood sugar symptoms: Atenolol can mask some low blood sugar symptoms, like a rapid heartbeat, in individuals taking blood sugar medications. Pay attention to sweating and dizziness as indicators instead. If diabetic, discuss blood sugar monitoring frequency with your provider.

• Overactive thyroid effects: For those with hyperthyroidism, atenolol can obscure heart-related symptoms. Stopping the drug suddenly might trigger a "thyroid storm," characterized by a high temperature, rapid heartbeat, and fainting. Seek urgent medical care if these symptoms arise.

• Drug interactions: Avoid combining atenolol with certain calcium channel blockers like diltiazem or verapamil, as this can lead to dangerously low heart rates and heart block.

• Pregnancy and breastfeeding risks: Atenolol may affect unborn or breastfed babies, leading to slow heart rate or low blood sugar. If pregnant, especially after the second trimester, or breastfeeding, discuss the risks and alternatives with your provider.

• Contraindications: This medication should not be used if you have a low heart rate (under 60 beats/minute), specific heart problems (e.g., first-degree heart block, cardiac shock), or heart failure. Consult your healthcare provider for guidance if any of these conditions apply.

Common side effects:

• tiredness
• dizziness
• lightheadedness
• nausea
• cold hands and feet

Less common but important to monitor:

• feeling depressed
• trouble breathing
• slow heart rate
• leg pain
• spinning sensation
• general weakness
• drowsiness
• vivid dreams
• diarrhea
• wheezing

Serious side effects:

• worsening heart failure
• bronchospasm
• severe allergic reaction

Interactions with high risk of serious adverse effects and should be avoided:

• Fingolimod

Interactions with moderate risk that may require dose adjustment, closer monitoring, or timing changes:

• Albuterol
• Ceritinib
• Clonidine
• Diltiazem
• Verapamil

Interactions with low risk that usually do not require a change in therapy:

• Acarbose
• Aspirin
• Ibuprofen
• Naproxen