People taking beta-blockers should therefore avoid taking potassium supplements, or eating large quantities of fruit (e.g., bananas), unless directed to do so by their doctor.
Cardioselective beta-blockers, e.g. bisoprolol and metoprolol succinate, are less likely to cause fatigue and cold extremities than non-selective beta-blockers.
While on beta-blockers, you should also avoid eating or drinking products that have caffeine or taking over-the-counter cough and cold medicines, antihistamines, and antacids that contain aluminum. You should also avoid drinking alcohol, because it can decrease the effects of beta-blockers.
A large study published last month in The Journal of the American Medical Association found that beta blockers did not prolong the lives of patients – a revelation that must have left many cardiologists shaking their heads (JAMA, vol 308, p 1340).
While stopping any beta-blocker may cause a mild response, abruptly stopping propranolol may lead to a withdrawal syndrome. Beta-blocker withdrawal can result in a rise in blood pressure, and in patients with heart disease, chest pain, heart attack, and even sudden death.
As an extension of their beneficial effect, they
slow heart rate and reduce blood pressure, but they may cause adverse effects such as heart failure or heart block in patients with heart problems.
Other important side effects include:
- Rash.
- Blurred vision.
- Disorientation.
- Insomnia.
- Hair loss.
- Weakness.
- Muscle cramps.
- Fatigue.
Guidelines recommend beta blocker therapy for three years, but that may not be necessary. Beta blockers work by blocking the effects of the hormone epinephrine, also called adrenaline. Taking beta blockers reduces your heart rate and blood pressure.
Non-cardioselective β-blockers can provoke or worsen bronchospasm in patients with chronic obstructive pulmonary disease (COPD) or asthma.
Beta blockers, also called beta adrenergic blocking agents, block the release of the stress hormones adrenaline and noradrenaline in certain parts of the body. This results in a slowing of the heart rate and reduces the force at which blood is pumped around your body.
In conclusion, oral timolol and infusion of propranolol were associated with a significantly higher risk of developing an asthma attack in patients, especially in those with a baseline asthma history, and should be avoided in patients who present a risk of asthma.
Beta-blockers, used to control blood pressure and heart disease, can make asthma worse. This group of drugs includes propranolol, atenolol and metoprolol. If you have started taking a beta-blocker and your asthma gets worse, tell your doctor.
Apparently, cardioselective β-blockers not only do not produce increased respiratory symptoms in patients with COPD but they are also associated with an augmented bronchodilator response to subsequent β-agonists (13).
Although these drugs are useful after the first dose, longterm use can cause worsening asthma symptoms. Beta-blockers are the complete opposite type of medication. Just now they are avoided in patients with asthma as after the first dose they can cause airway narrowing and cause an asthma attack.
BBs reduce mortality in patients with COPD and coexisting CAD and should be used whenever possible. Cardioselective BBs are safe in patients with COPD who have an indication for their use. Nonselective BBs are better avoided in general, except in patients with heart failure who may benefit from the use of Carvedilol.
Traditional contraindications to beta-blockers are peripheral vascular diseases, diabetes mellitus, chronic obstructive pulmonary disease (COPD) and asthma.
Blood pressure medications/beta blockers: If you're taking these medications, talk to your health care provider about the ideal time of day to take them, though as a general rule of thumb, evening is best. “Providers may specify to take these in the evening because of side effects that can occur,†Verduzco said.
As seen in figure 1, the most commonly prescribed beta-blocker medications are metoprolol succinate and metoprolol tartrate. While both drugs are used to treat heart-related issues, their applications are very different.
Even among patients on beta-blockers, the proportion with HR≥70 bpm was 41.1%. Also, among patients with anginal symptoms, only 22.1% achieved a HR≤60 bpm, despite the fact that stable angina guidelines recommend a target HR of 55–60 bpm in patients with angina on beta-blockers [22].
Don't stop taking your beta-blocker medicine suddenly because this may be harmful. If you stop beta-blockers abruptly, your blood pressure may go up suddenly and you may get irregular heart rhythms (palpitations).
How to Take Beta-Blockers. You can take them in the morning, at meals, and at bedtime. When you take them with food, you may have fewer side effects because your body absorbs the drug slower.
Beta blockers can cause shortness of breath in susceptible individuals. Beta blocker eyedrops can also cause shortness of breath by inhibiting cardiac output (decreasing the amount of blood the heart pumps out) reducing pulse, or slowing down the heart rate response during exercise.
The therapeutic effect of beta adrenoceptor blockers in angina pectoris can be ascribed to an inhibition of 13, receptor mediated stimulation of heart rate and myocardial contractility, resulting in an improved oxygen supply-demand balance in the myocardium.
A clinical study conducted with patients taking beta-blockers showed significant improvement in people's quality of sleep when they continually took a 2.5mg melatonin supplement one hour prior to going to sleep.
Beta blockers are widely used in the management of cardiac conditions and thyrotoxicosis, and to reduce perioperative complications. Asthma and chronic obstructive pulmonary disease (COPD) have been classic contraindications to the use of beta blockers because of their potential for causing bronchospasm.
Beta-1 selective antagonists such as bisoprolol, nebivolol and metoprolol are preferred to the nonselective carvedilol as they are less likely to produce bronchoconstriction in COPD.
