Supplement to StrokeVol 21, No 12, December 1990
175 Pages, Soft Cover
Drug Treatment of Strokeand Ischemlc Brain: From
Acetylsalicylic Acid toNew Drugs — 1 0 0 Years
of Pharmacology at BayerWuppertal-Elberfeld
Stroke Supplement
Scheveningen, The NetherlandsJune 28-30, 1990
Stanislav Kazda, MDFrank J. Morich, MDGuest Editors
Order No 73-6063
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Major TopicsHistory of Aspirin
Effects of Calcium Antagonists
Stroke Prevention by Risk FactorModification
Action of Fibrinolytic Agents
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ONCE-A-DAY
CARDURA.©(doxazosin mesy late] ftgfir* ^ 8mg^ ^ Convenient once-a-day dosage
Most responsive patients arecontrolled with one daily dose of4 to 8 mg1
—recommended initial dose is1 mg, with dosage range of 1 mgto 16 mg per day.
Reference: 1 . Data available on request from Roeng.CARDURA* (doxazosin mesylate) TabletsBriel Summary ol Prescribing InformationINDICATIONS AND USAGE
CARDURA (doxazosin mesylate) is indicated for me treatment ol hypertensionCARDURA may be used alone or in combination with diuretics or beta-adrenergicclocking agents There is limited experience with CARDURA in combination withangiotensin converting enzyme inhibitors or calcium channel blottersCONTRAINDICATIONSCARDURA is conlraindicated in patients with a known sensitivity to quinazohnes|e g prazosm. terazosin)WARNINGSSyncope and "First-dose" Effect:Doxazosin. like other alpha-adrenergic blocking agents, can causemarked hypotension, especially in the upright position, with syncopeand other postural symptoms such as dizziness. Marked orthostaticetlects are most common with the lirst dose but can also occur whenthere is a dosage increase, or if therapy is interrupted tor more than alew days To decrease the likelihood of excessive hypotension andsyncope, it is essential that treatment be initiated with the 1 mg dose.The 2, 4. and 8 mg tablets are not tor initial therapy. Dosage shouldthen be adjusted slowly {see OOSAGE AND ADMINISTRATION section)with increases in dose every two weeks. Additional antihypertensiveagents should be added with caution
Patients being titrated with doxazosin should be cautioned to avoidsituations where injury could result should syncope occur.
In an early investigational study ol the safety and tolerance ol increasing dailydoses ol doxazosin in normotensives beginning al 1 mg/day, only 2 ot 6 subjectscould tolerate more than 2 mg/day without experiencing symptomatic posturalhypotension In another study ol 24 healthy normolensive male subjects receivinginitial doses ol 2 mg/oay ol doxazosin, seven (29%) ol the subjects experiencedsymptomatic postural hypotension between 0 5 and 6 hours alter the lirst dosenecessitating termination ol the study In this study 2 ol the normotensivesubjects experienced syncope Subsequent trials in hypertensive patients alwaysbegan doxazosin dosing al f mg/day resulting in a 4% incidence ol postural sideeffects at 1 mg/day witti no cases ol syncope
In multiple dose clinical trials involving over 1500 patients with dose titrationevery one to two weeks syncope was reported in 0 7% ol patients None ol Iheseevents occurred al the starting dose ol 1 mg and 1 2% (8/664) occurred al 16mg/day
II syncope occurs, the patient should be placed in a recumbentposition and treated supportively as necessary.PRECAUTIONSGeneral:1. Orthostatic HypotensionWhile syncope is the most severe orthostatic effect ol CARDURA. other symploms01 lowered blood pressure, such as dizziness, lightheadedness, or vertigo, canoccur especially al initiation ol therapy or at the lime ol dose increases Thesewere common in clinical trials, occurring in up lo 23% ol all patients treated andcausing discontinuation ol therapy in about 2%
In placebo controlled titration trials orthostatic effects were minimized bybeginning therapy at 1 mg per day and litrafing every two weeks lo 2,4, or B mgper day There was an increased frequency ol orthostatic effects in patients given8 mg or more, 10%, compared to 5% at 1-4 mg and 3% in the placebo group
Patients in occupations in which orthoslalic hypotension could be dangerousshould be treated with particular caution
If hypotension occurs the patient should be placed in the supine position andil this measure is inadequate volume expansion with intravenous fluids orvasopressor therapy may be used A transient hypotensive response is not acontraindication to further doses ol CARDURA2 Impairs* lh»r function:CARDURA should be administered with caution to patents with evidence olimpaired hepatic function or to patients receiving drugs known to influencehepatic metabolism (see CLINICAL PHARMACOLOGY) There is no controlledclinical experience with CARDURA in patients with these conditions3. LukepiuH/Wntmpeila:Analysis of hematologic data from patients receiving CARDURA in controlledclinical trials showed that the mean WBC (N=474) and mean neutrophil counts(N=419) were decreased by 2 4% and 1 0% respectively, compared lo placebo, aphenomenon seen with other alpha blocking drugs A search through a data baseol 2400 patients revealed 4 in which drug-related neulropenia could not be ruledoul Two had a single low value on the last day of treatment Two had stable non-progressive neutrophil counts in the 1000/mm3 range over periods ot 20 and 40weeks In cases where lollow-up was available the WBCs and neutrophil countsreturned to normal after discontinuation ol CARDURA No patients becamesymptomatic as a result ol the low WBC or neutrophil counts
Patients should be made aware ot the possibility ol syncopal and orttwstaficsymptoms, especially at tne initiation of therapy, and urged to avoid driving orhazardous tasks lor 24 hours after trie lirst dose, after a dosage increase, and afterinterruption ol therapy when treatment is resumed They should be cautioned loavoid situations where injury could result should syncope occur during initiationol doxazosin therapy They should afso be advised of the need lo sit or lie downwhen symptoms of lowered Mood pressure occur, although these symptoms arenot always orthostatic, and lo be careful when rising from a silting or tying posi-tion It dizziness, licjhrheadedness, or palpitations are bothersome they should bereported lo the physician, so thai dose adjustment can be considered Patientsshould also be tok) that drowsiness or somnolence can occur with doxazosin.requiring caution in people who must drive or operate heavy machinery.
Begin all patientswith CARDURA I mgonce doily to mini-
mize side effects, evaluatesupine and standing bloodpressure. PrescribeCARDURA 2 mg once daily,if necessary.
0 evaluate for bloodpressure control.Prescribe 4 mg once
daily, if necessary.
4 mg
tvaluate for bloodpressure control.Prescribe 8 mg once
daily, if necessary.Maximum recommendeddosage is 16 mg oncedaily.
8 mg
Drug Interactions:Mos! (98%) ol plasma doxazosin is protein Oound In vitro (lato in human plasmaindicate that CARDURA has no effect on protein binding ol digoxin. warfarin,phenytom or mdomethacin There is no information on the effect ol other highlyplasma protein bound drugs on doxazosin binding CARDURA has beenadministered without any evidence of an adverse drug interaction to patientsreceiving thiazide diuretics beta blocking agents, and nonsteroidal anli-intlammatory drugs
DnfA»bontory test interactions:None knownCardiac Toikrry in Animals:An increased incidence of myocardial necrosis or fibrosis was displayed bySprague-Dawley rats after 6 months ol dietary administration al concentrationscalculated to provide 80 mg doxazosin/fcg/day and after 12 months of dietaryadministration at concentrations calculated to provide 40 mg doxazosin/kg/day(150 limes the maximum recommended human dose assuming a patient weight of60 kg) There is no evidence that simitar lesions occur in humansCarclnojenesis, Mutagenesis and Impairment of FertilityChronic dietary administration (up to 24 months) of doxazosin mesylate atmaximally tolerated concentrations (highest dose 40 mg/kg about 150 times themaximum recommended human dose of 16 mg/60 kg) revealed no evidence ofcarcinogenicity in rals There was also no evidence ot carcinogenicity in asimilarly conducted study (up to 18 months ol dietary administration) in miceThe mouse study, however, was compromised by the failure to use a maximallytolerated dose ol doxazosin
Mulagenicity studies revealed no drug- or metabolite-related etlects at eitherchromosomal or subchromosomal fevels
Studies in rats showed reduced fertility in males treated with doxazosjn at oraldoses ol 20 (but not 5 or 10) mg/kg/day. about 75 times the maximumrecommended human dose This effect was reversible within two weeks ot drugwithdrawalPregnancyTeratoftnic Effects, Pregnancy Category B. Studies in rabbits and rats aldaily oral doses ol up lo 40 and 20 mg/kg. respectively (150 and 75 limes themaximum recommended daily dose ol 16 mg. assuming a patient weight of 60kg), have revealed no evidence ol harm to the fetus The rabbit study, however,was compromised by the failure to use a maximally tolerated dose of doxazosinThere are no adequate and well-controlled slud^s in pregnant women Becauseanimal reproduction studies are not always predictive ol human response.CARDURA should be used during pregnancy only it clearly needed
Radioactivity was lound to cross the placenta following oral administration ollabelled doxazosin to pregnant ralsNMfcHitOftnic Effects. In pen-postnatal studies in rats, postnataldevelopment at maternal doses ol 40 or 50 mg/kg/day ol doxazosin was delayedas evidenced by slower body weight gain and a slightly later appearance olanatomical features and rellexesNursing MothersIt is not known whether this drug is excreted in human milk Because many drugsare excreted in human milk caution should be exercised when CARDURA isadministered to a nursing motherPttiatrlc UseSafely and effectiveness in children have not been establishedADVERSE REACTIONSCARDURA has been administered to approximately 4000 patients, ol whom 1679were included in the clinical development program In that program, minoradverse effects were frequent, but led to discontinuation ol treatment in only 7%ol patients In placebo-controlled studies adverse etlects occurred m 49% and40% ol patients in the doxazosin and placebo groups, respectively, and led lodiscontinuation in 2% of patients in each group The major reasons fordiscontinuation were postural effects (2%), edema, malaise/fatigue, and someheart rate disturbance, each about 0 7%
In controlled clinical trials directly comparing CARDURA to placebo there wasno significant difference in the incidence ol side effects, except tor dizziness(including postural), weight gain, somnolence and latigue/malaise Posturaleffects and edema appeared to be dose related
The prevalence rales presented below are based on combined data tromplacebo-controlled studies invotving once daily administration ot doxazosin aldoses ranging Irom 1-16 mg Tat* 1 summarizes those adverse experiences(possibly/probably related) reported tor patients in Ihese studies where theprevalence rale in the doxazosin group was at least 0 5% or where the reaction isof particular interest
DOXAZOSIN PLACEBO
TABLE 1 ADVERSE REACTIONS DURING PLACEBO CONTROLLED STUDIES
CARDIOVASCULAR DizzinessVertigoPostural HypotensionEdemaPalpitationArrhynrnaHypotensionTachycardiaPeripheral Ischemia
SKIN APPENOAGES RashPruritus
MUSCULOSKELETAl Arthralgia/ArlhrrtisMuscle WeaknessMyalgia
DOXAZOSIN(N=339)
19%2%
03%4%2%1%1%
03%03%
1%1%
1%1%1%
PLACEBO(N=336)
9%1%0%3%3%0%0%1%0%
1%1%
0%0%0%
(N=339) (N=336)
CENTRAL 1 HeadacheParesthesiaKinetic DisordersAtaxiaHyperion 1aMuscle Clamps
14%1%1%1%1%1%
16%1%0%0%0%0%
AUT0NOMIC
SPECIAL SENSES
PSYCHIATRIC
Mouth DryFlushing
Vision AbnormalConjunctivitis/Eye PainTinnitus
SomnolenceNervousnessDepressionInsomniaSexual Dysfunction
2%1%
2%1%1%
5%2%1%1%2%
2%0%1%1%
03%
1%2%1%1%1%
GASTROINTESTINAL NauseaDiarrheaConstipationDyspepsiaFlatulenceAbdominal PainVomiting
3%2%1%1%1%0%0%
4%3%1%f%1%2%1%
RESPIRATORY RhinitisDyspneaEpistaxis
3%1%1%
1%1%0%
URINARY PolyuriaUrinary IncontinenceMicturation Frequency
2%1%0%
0%0%2%
Fatigue/MalaiseChest PainAstheniaFace EdemaPain
f2%2%1%1%2%
6%2%1%0%2%
GENERAL
Additional adverse reactions have been reported, but Ihese are. in general, notdistinguishable Irom symploms that might have occurred in the absence olexposure to doxazosin The following adverse reactions occurred with a frequencyol between 0 5% and 1% syncope, hypoesthesia, increased sweating, agitation,increased weight The following additional adverse reactions were reported by<0 5% of 3960 patients who received doxazosin in controlled or open, short- orlong-term clinical studies, including international studies CardiovascularSystem angina pectoris, myocardial infarction, cerebrovascular accident,Autonomlc Nervous System pallor. Metabolic thirst, gout, hypokalemia.Hematopoielic lymphadenooalhy. purpura. Reproductive System breast pain.Skin Disorders alopecia, dry skin, eczema. Central Nervous System paresis,Iremor, twitching, contusion, migraine, impaired concentration. Psychiatricparoniria. amnesia, emotional lability, abnormal thinking, depersonalization.Special Senses parosmia. earache, taste perversion, photophobia, abnormallacrimalion. Gastrointestinal System increased appetite, anorexia, lecalincontinence, gastroenteritis. Respiratory System bronchospasm. sinusitis,coughing, pharyngitis. Urinary System renal calculus. General Body System hotflashes, back pain, infection, lever/rigors, decreased weight, influenza-likesymptoms
CARDURA has not been associated with any clinically significant changes inroutine biochemical tests No clinically relevant adverse effects were noted onserum potassium, serum glucose uric acid blood urea nitrogen creatimne orliver lunction tests CARDURA has been associated with decreases in while bloodcell counts (See Precautions)
The oral L D ^ ol doxazosin is greater than 100O mg/kg in mice and rats Themost likely manifestation ot overdosage would be hypotension, lor which theusual treatment would be intravenous infusion of lluid As doxazosin is highlyprotein bound dialysis wouW not be indicatedDOSA6E AND ADMINISTRATIONOOSAGE MUST K INDIVIDUALIZED. The initial dosage ol CARDURA inhypertensive patients is 1 mg given once daily Depending on the individualpatient's standing Wood pressure response (based on measurements taken at 2 6flours postdose and 24 hours postdose). dosage may then be increased lo 2 mgand thereafter if necessary Io4mg.8mgand16mglo achieve the desiredreduction in blood pressure Increases m dose beyond 4 mg increase thelikelihood of excessive postural etlects including syncope, posturaldizziness/vertigo, postural hypotension At a titrated dose o<16 mg once daily thefrequency ot postural e*ct5 is about t2H compared to 3% tor placeboHOWSUmCDCARDURA (doxazosin mesylate) is available as colored tablets for oraladministration Each tablet contains doxazosin mesylate equivalent to 1 mg(white) 2 mg (yellow), 4 mg (orange) or 8 mg (green) of the active constituentdoxazosin
CARDURA" TABLETS are available as 1 mg (white). 2 mg (yellow)4 mg (orange) and 8 mg (green) scored tablets Bottles of 100 1 mg (NDC 0O49-
2750-66) 2 mg (NOC 0049-276O-66I 4 mg (NDC 0049-2770-66) 8mg (NOC0049-2780-66)
Recommended Storage Store below 86°F{3O°C)CAUTION: Federal law prohibits dispensing without prescription6S-453MO-0 ^m^ . Issued Nov 1990
(j^ Koerig\ diviMon »f Pfizrr Pharmarruiiral*
ONCE-A-DAY
oxazosin Scored Tablets1mg,2mg,4mg, 8mg
CARDURA is well tolerated. Only three common side effects were different from placebo: dizziness, somnolence, and fatigue.These were generally mild and transient; only 2% of patients in placebo-controlled studies discontinued due to adverse effects—the same rate as placebo. Syncope has been reported, but rarely (< l%).
Please see brief summary of prescribing information on adjacent page of this advertisement. © 1991, Pfizarkic.