Class IV antidysrhythmics or calcium channel blockers have what action on the cardiovascular system?

Terazosin is a medication that belongs to the class of alpha-adrenergic blockers, which relax the muscles in the prostate and bladder neck, making it easier to urinate.It also lowers blood pressure by relaxing the veins and arteries, allowing blood to flow more easily.Therefore, terazosin can cause dizziness or fainting, especially when getting up from a sitting or lying position.To prevent this, the patient should rise slowly and avoid standing for long periods or becoming overheated.

Choice B is wrong because terazosin is not a cure for benign prostatic hyperplasia (BPH), but a symptom reliever.Stopping the medication may cause the urinary problems to return or worsen.

The patient should continue taking terazosin as prescribed by the doctor, unless advised otherwise.

Choice C is wrong because decreasing fluid intake may increase the risk of dehydration, urinary tract infections, bladder stones, and kidney problems.

The patient should drink enough fluids to stay hydrated and flush out the urinary system.

Choice D is wrong because grapefruit juice may interact with terazosin and increase its blood levels, leading to more side effects such as low blood pressure, drowsiness, or headache.

The patient should avoid drinking grapefruit juice while taking terazosin, or consult the doctor before doing so.

Atorvastatin is a type ofstatin, which are the most potent antilipidemic agents, and have proven to lower the risk of myocardial infarction by reducing the levels of low-density lipoprotein (LDL) cholesterol and triglycerides in the blood.Statins also slightly increase the level of high-density lipoprotein (HDL) cholesterol, which is beneficial for cardiovascular health.

Choice B, niacin, is a type ofnicotinic acid, which can lower LDL cholesterol and triglycerides, and increase HDL cholesterol, but it is less effective than statins and has more side effects, such as flushing, itching, and liver toxicity.

Choice C, gemfibrozil, is a type offibric acid derivative, which can lower triglycerides and increase HDL cholesterol, but have little effect on LDL cholesterol.They are mainly used for patients with high triglyceride levels or low HDL cholesterol levels.

Choice D, amlodipine, is not an antilipidemic agent at all.It is a type ofcalcium channel blocker, which is used to treat hypertension and angina by relaxing the blood vessels and reducing the workload of the heart.