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Associate Professor, University of Puerto Rico School of Medicine
Most benzodiazepines are converted to active metabolites in phase I oxidative reactions catalyzed by cytochrome P450 enzymes symptoms hyperthyroidism order zerit on line amex. The active metabolites of chlordiazepoxide medicine cat herbs order zerit line, diazepam medications causing dry mouth generic zerit 40 mg without prescription, and flurazepam are long acting and contribute to the long duration of action of these agents. The active metabolites of alprazolam, estazolam, midazolam, and triazolam are shorter acting. Each of these active metabolites Chapter 19 y Sedative-Hypnotic and Anxiolytic Drugs 191 Chlordiazepoxide (active) Desmethylchlordiazepoxide (active) Demoxepam (active) Flurazepam (active) Hydroxy/ desalkyl metab (active) Diazepam (active) Chlorazepate (inactive) Figure 19-1. Alprazolam, midazolam, and triazolam are converted to a short-acting active metabolite. All benzodiazepines, including those with no active metabolites, are eventually converted to glucuronide compounds that are pharmacologically inactive and are excreted in the urine. The benzodiazepines that do not undergo phase 1 metabolism and are directly conjugated include oxazepam, temazepam, and lorazepam ("out the liver"), and these may be the safest benzodiazepines to use in treating elderly patients. These three drugs may be safer for use by elderly patients, because the capacity to conjugate drugs does not decline with age as much as the capacity for oxidative biotransformation does. Hence, these three drugs are less likely to accumulate to toxic levels in elderly patients. Benzodiazepines also undergo some degree of enterohepatic cycling that prolongs their duration of action. In fact, some patients who are taking a drug such as diazepam may notice an increased sedative effect after eating a high-fat meal. The fatty meal causes the gallbladder to empty and thereby delivers bile containing diazepam to the intestines for reabsorption into the circulation. This receptor-ion channel complex is made up of five subunits with the major form of the complex containing, and subunits. Benzodiazepines bind to receptors made up of both 1 and 2 subunits, whereas the newer nonbenzodiazepine agents (see later) are selective for receptors containing 1 subunits. Ethanol (ethyl alcohol) binds to a distinct site on the ionophore and enhances chloride influx. The ionophore also contains binding sites for steroids and inhalational anesthetics. By increasing chloride conductance, these drugs cause neuronal membrane hyperpolarization, and this in turn counteracts the depolarizing effect of excitatory neurotransmitters. She was told to take one in the morning with her breakfastandwasadvisedtoincreaseheractivitiesto"take her mind off her worries. Her friends noted that she was not comingoutofherroomattheassistedlivingcenterasmuch assheusedto,andtheyknockedonherdoortocheckup onher. Theyconvincedhertocallherdoctor,whotoldher to stop taking the second pill of diazepam at night; the doctorprescribedzolpidem,atadoseof5mg,tobetaken at night to help her sleep. Over the next few days, the patient was more alert during the day and resumed her activities. Phase1 or oxidative drug biotransformation (metabolism) in the elderlyisreduced,andthispatientpopulationisespecially sensitivetothebuildupofactivemetabolitesofmanybenzodiazepines,includingdiazepam. The barbiturates exhibit a linear dose-response effect, which progresses from sedation to respiratory depression, coma, and death. Intravenous administration of benzodiazepines can produce anesthesia and mild respiratory depression. The effect of benzodiazepines on adenosine may also explain why these drugs dilate coronary arteries and decrease total peripheral resistance. Lower doses have a sedative and anxiolytic effect, whereas higher doses produce hypnosis (sleep) and anesthesia.
Chapter 11 y Antianginal Drugs Nimodipine Nimodipine is used for the purpose of reducing the neurologic complications of subarachnoid hemorrhage medications zanaflex generic zerit 40mg without prescription, which is one of the causes of stroke symptoms zinc overdose buy discount zerit on line. The drug dilates small cerebral vessels and increases collateral circulation to the affected areas of the brain symptoms valley fever purchase generic zerit on line. It also reduces neuronal damage caused by the excessive release of calcium that is evoked by cerebral ischemia. Nimodipine should be given only by mouth or feeding tube and never by intravenous administration, a method that has caused severe hypotension, cardiac arrest, and fatalities. Diltiazem and Verapamil Diltiazem and verapamil are effective treatments for typical and variant angina. Because these drugs can suppress cardiac contractility, caution should be exercised when administering them to patients with heart failure, especially verapamil. In patients who have typical angina without heart failure, the drugs have the advantage of reducing the heart rate and contractility in addition to their effects on myocardial wall tension. Both verapamil and diltiazem reduce the clearance of digoxin and can thereby increase serum digoxin levels and precipitate digoxin toxicity. By this mechanism, ranolazine is believed to reduce diastolic wall tension, improve diastolic subendocardial perfusion, and reduce oxygen consumption. Unlike other antianginal drugs, ranolazine has no effect on heart rate or blood pressure. Clinically, ranolazine increases exercise capacity in angina patients, resulting in fewer anginal symptoms and decreasing the need for nitroglycerin use. The drug seems to be an attractive alternative or supplement to conventional antianginal agents and can be used with -blockers and nitrates. Clinical trials suggest that ranolazine also improves glycemic control in diabetics, improves vascular endothelial function by increasing vasodilation, and decreases the incidence of atrial fibrillation. The most common side effects of ranolazine are mild dizziness, headache, nausea, and constipation in less than 2% of patients, and the drug is usually better tolerated than conventional antianginal drugs. Because of its short half-life, a sustained release preparation of the drug is available. Among the -blockers used in the management of angina are atenolol, metoprolol, nadolol, and propranolol. In typical angina, they prevent ischemic episodes because of their ability to prevent exercise-induced tachycardia and increased myocardial oxygen demand. The -blockers have a negative inotropic effect that can be hazardous to patients with heart failure if large doses are given. Because the combination of verapamil and a -blocker may significantly reduce cardiac output, it should usually be avoided. Although fatty acids are the major fuel for the heart, glucose is metabolized more efficiently and generates more energy per unit of oxygen used. Trimetazidine inhibits ketoacyl coenzyme-A thiolase, a key enzyme in the -oxidation pathway of fatty acid metabolism. The resulting decrease in fatty acid oxidation evokes a compensatory increase in glucose metabolism and reduces oxygen consumption by about 20%. Trimetazidine has also been found to increase ejection fraction in persons with left ventricular dysfunction. Treatment of concurrent hypertension, hyperlipidemia, diabetes, and obesity can slow coronary artery disease progression, whereas antithrombotic agents.
AcuteProphylaxis When administered 15 minutes before exercise or prior to exposure to other precipitatingfactors (eg symptoms zinc deficiency adults purchase zerit 40 mg with visa, cold symptoms kidney failure dogs cheap zerit 40 mg with visa, environmental agents) treatment 100 blocked carotid artery buy generic zerit on line, cromolyn canprevent an asthmaattack. Theophylline PreadministrationAssessment TherapeuticGoal Theophylline is a bronchodilator taken on a regular schedule to decrease the intensityandfrequencyofmoderatetosevereasthmaattacks. Severe effects (convulsions, ventricular fibrillation) can occur at drug levels above 30mcg/mL. Tobacco and marijuana smoking can increase clearance to 50% in adults and 80% in older adults. Accordingly, it is important to inquire regarding smoking habits in order to optimizedosing. Phenobarbital, phenytoin, rifampin, and other drugs can lower theophylline levels. Managetoxicityby(1)discontinuing theophylline and (2) administering activated charcoal (to decrease theophylline absorption) plus a cathartic (to accelerate fecal excretion). Major symptoms are sneezing, rhinorrhea, pruritus, and nasal congestion caused by dilation and increased permeability of nasal blood vessels. In addition, some patients experience associated conjunctivitis, sinusitis, and even asthma. Symptomsaretriggeredbyairborneallergens,whichbindtoimmunoglobulinE (IgE) antibodies on mast cells, and thereby cause release of inflammatory mediators, including histamine, leukotrienes, and prostaglandins. Seasonal rhinitis, also known as hay fever, occurs in the spring and fall in reaction to outdoor allergens such as fungi and pollens from weeds, grasses, and trees. Perennial (nonseasonal) rhinitis is triggered by indoor allergens, especially the housedustmiteandpetdander. Principal among these are (1) glucocorticoids (intranasal), (2) antihistamines (oral and intranasal),and(3)sympathomimetics(oralandintranasal). Oral:Restlessness, insomnia,increased bloodpressure Nasal:Reboundnasal congestion Nasaldryingandirritation Anticholinergics Nasal Blocknasalcholinergicreceptorsandtherebyreduce secretions;donotdecreasesneezing,nasal congestion,orpostnasaldrip. Antileukotrienes Oral Rareneuropsychiatriceffects ApproachestorhinitismanagementarebasedinlargepartonTheDiagnosis and Management of Rhinitis: An Updated Practice Parameter (2008), an evidence-based guideline developed by the Joint Task Force on Practice Parameters, representing the American Academy of Allergy, Asthma & Immunology; the American College of Allergy, Asthma and Immunology; and theJointCouncilofAllergy,AsthmaandImmunology. ActionsandUses Intranasal glucocorticoids are the most effective drugs for prevention and treatment of seasonal and perennial rhinitis. Because of their antiinflammatory actions, these drugs can prevent or suppress the major symptoms of allergic rhinitis:congestion,rhinorrhea,sneezing,nasalitching,anderythemain90%of patients who use them properly. Three of these-budesonide [Rhinocort Aqua], fluticasone propionate [Flonase], and triamcinolone [Nasacort Allergy 24 hours]-are available in the United States without a prescription. Ofgreatest concern are adrenal suppression and slowing of linear growth in children (whether final adult height is reduced is unknown). Systemic effects are least likely with ciclesonide, fluticasone, and mometasone, which have very low bioavailability(seeTable61. Preparations,Dosage,andAdministration Intranasal glucocorticoids are administered using a metered-dose spray device. Aftersymptomsareundercontrol,the dosage should be reduced to the lowest effective amount. For patients with seasonal allergic rhinitis, maximal effects may require a week or more to develop.
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