Dimethyl sulfoxide Intravesical and Labetalol Hydrochloride

• Generic Name: dimethyl sulfoxide
• Dosage Forms: n.a.
• Other Brand Names: Cryoserv, Rimso-50

Dimethyl sulfoxide is a purified preparation used in the bladder to relieve the symptoms of the bladder condition called interstitial cystitis. A catheter (tube) or syringe is used to put the solution into the bladder where it is allowed to remain for about 15 minutes. Then, the solution is expelled by urinating.

Interstitial cystitis is the only human use for dimethyl sulfoxide that is approved by the U.S. Food and Drug Administration (FDA).

Claims that dimethyl sulfoxide is effective for treating various types of arthritis, ulcers in scleroderma, muscle sprains and strains, bruises, infections of the skin, burns, wounds, and mental conditions have not been proven.

Although other preparations of dimethyl sulfoxide are available for industrial and veterinary (animal) use, they must not be used by humans, because of their unknown purity. Impurities in these preparations may cause serious unwanted effects in humans. Even if dimethyl sulfoxide is applied to the skin, it is absorbed into the body through the skin and mucous membranes.

Dimethyl sulfoxide is available only with your doctor's prescription.

• Generic Name: labetalol
• Dosage Forms: n.a.
• Other Brand Names: Trandate, Normodyne

Management of hypertension, alone or in combination with other classes of antihypertensive agents.

β-Blockers generally not preferred for first-line therapy of hypertension according to current evidence-based hypertension guidelines, but may be considered in patients who have a compelling indication (e.g., prior MI, ischemic heart disease, heart failure) for their use or as add-on therapy in those who do not respond adequately to the preferred drug classes (ACE inhibitors, angiotensin II receptor antagonists, calcium-channel blockers, or thiazide diuretics). A 2017 ACC/AHA multidisciplinary hypertension guideline states that β-blockers used for ischemic heart disease that are also effective in lowering BP include bisoprolol, carvedilol, metoprolol succinate, metoprolol tartrate, nadolol, propranolol, and timolol.

Individualize choice of therapy; consider patient characteristics (e.g., age, ethnicity/race, comorbidities, cardiovascular risk) as well as drug-related factors (e.g., ease of administration, availability, adverse effects, cost).

The 2017 ACC/AHA hypertension guideline classifies BP in adults into 4 categories: normal, elevated, stage 1 hypertension, and stage 2 hypertension.

Source: Whelton PK, Carey RM, Aronow WS et al. 2017 ACC/AHA/AAPA/ABC/ACPM/AGS/APhA/ASH/ASPC/NMA/PCNA guideline for the prevention, detection, evaluation, and management of high blood pressure in adults: a report of the American College of Cardiology/American Heart Association Task Force on Clinical Practice Guidelines. Hypertension. 2018;71:e13-115.

Individuals with SBP and DBP in 2 different categories (e.g., elevated SBP and normal DBP) should be designated as being in the higher BP category (i.e., elevated BP).

The goal of hypertension management and prevention is to achieve and maintain optimal control of BP. However, the BP thresholds used to define hypertension, the optimum BP threshold at which to initiate antihypertensive drug therapy, and the ideal target BP values remain controversial.

The 2017 ACC/AHA hypertension guideline generally recommends a target BP goal (i.e., BP to achieve with drug therapy and/or nonpharmacologic intervention) <130/80 mm Hg in all adults regardless of comorbidities or level of atherosclerotic cardiovascular disease (ASCVD) risk. In addition, an SBP goal of <130 mm Hg generally is recommended for noninstitutionalized ambulatory patients ≥65 years of age with an average SBP of ≥130 mm Hg. These BP goals are based upon clinical studies demonstrating continuing reduction of cardiovascular risk at progressively lower levels of SBP.

Other hypertension guidelines generally have based target BP goals on age and comorbidities. Guidelines such as those issued by the JNC 8 expert panel generally have targeted a BP goal of <140/90 mm Hg regardless of cardiovascular risk and have used higher BP thresholds and target BPs in elderly patients compared with those recommended by the 2017 ACC/AHA hypertension guideline.

Some clinicians continue to support previous target BPs recommended by JNC 8 due to concerns about the lack of generalizability of data from some clinical trials (e.g., SPRINT study) used to support the 2017 ACC/AHA hypertension guideline and potential harms (e.g., adverse drug effects, costs of therapy) versus benefits of BP lowering in patients at lower risk of cardiovascular disease.

Consider potential benefits of hypertension management and drug cost, adverse effects, and risks associated with the use of multiple antihypertensive drugs when deciding a patient's BP treatment goal.

For decisions regarding when to initiate drug therapy (BP threshold), the 2017 ACC/AHA hypertension guideline incorporates underlying cardiovascular risk factors. ASCVD risk assessment is recommended by ACC/AHA for all adults with hypertension.

ACC/AHA currently recommend initiation of antihypertensive drug therapy in addition to lifestyle/behavioral modifications at an SBP ≥140 mm Hg or DBP ≥90 mm Hg in adults who have no history of cardiovascular disease (i.e., primary prevention) and a low ASCVD risk (10-year risk <10%).

For secondary prevention in adults with known cardiovascular disease or for primary prevention in those at higher risk for ASCVD (10-year risk ≥10%), ACC/AHA recommend initiation of antihypertensive drug therapy at an average SBP ≥130 mm Hg or an average DBP ≥80 mm Hg.

Adults with hypertension and diabetes mellitus, chronic kidney disease (CKD), or age ≥65 years are assumed to be at high risk for cardiovascular disease; ACC/AHA state that such patients should have antihypertensive drug therapy initiated at a BP ≥130/80 mm Hg. Individualize drug therapy in patients with hypertension and underlying cardiovascular or other risk factors.

In stage 1 hypertension, experts state that it is reasonable to initiate drug therapy using the stepped-care approach in which one drug is initiated and titrated and other drugs are added sequentially to achieve the target BP. Initiation of antihypertensive therapy with 2 first-line agents from different pharmacologic classes recommended in adults with stage 2 hypertension and average BP >20/10 mm Hg above BP goal.

Black hypertensive patients generally tend to respond better to monotherapy with calcium-channel blockers or thiazide diuretics than to β-blockers. However, diminished response to β-blockers is largely eliminated when administered concomitantly with a thiazide diuretic.

Recommended by ACOG and other experts as an appropriate drug of choice in pregnant women who require antihypertensive therapy.

Severe Hypertension and Hypertensive Crisis

Used parenterally for immediate BP reduction in severe hypertension or hypertensive emergency; generally suitable for most hypertensive emergencies except when acute cardiac failure is present.

One of several recommended parenteral agents for use in the hospital setting to urgently lower BP in severely hypertensive pregnant women, including those with preeclampsia or eclampsia.

Has been used for rapid reduction of BP in children and adolescents with acute severe hypertension and life-threatening symptoms.

Pheochromocytoma

Has been used alone in patients with pheochromocytoma to control hypertension and symptoms resulting from excessive β-receptor stimulation. However, some clinicians caution against use unless pretreatment with α-adrenergic blocking agents (e.g., IV phentolamine) has occurred. May be more effective when tumors predominantly secrete epinephrine rather than norepinephrine, and with sustained rather than paroxysmal hypertension.

Controlled Hypotension during Anesthesia

Treatment to produce controlled hypotension during anesthesia to reduce bleeding resulting from surgical procedures.

Chronic Stable Angina

Long-term management of chronic stable angina pectoris.

β-Blockers are recommended as first-line anti-ischemic drugs in most patients with chronic stable angina; despite differences in cardioselectivity, intrinsic sympathomimetic activity, and other clinical factors, all β-blockers appear to be equally effective for this use.

Tetanus

Management of sympathetic overactivity syndrome associated with severe tetanus.