DESCRIPTION
id: 1b1fd475-ba76-43e5-b944-911252dba5da
displayName: DESCRIPTION SECTION
FDA Article Code: 34089-3
Atenolol and chlorthalidone tablets are for the treatment of hypertension. It combines the antihypertensive activity of two agents: a beta1-selective (cardioselective) hydrophilic blocking agent (atenolol), and a monosulfonamyl diuretic (chlorthalidone). Atenolol is Benzeneacetamide, 4-[2-hydroxy-3-[(1-methylethyl)amino]propoxy]-. It has the following structural formula:
Structural Formula of Atenolol
C14H22N2O3 M.W. 266.34
Atenolol (free base) is a relatively polar hydrophilic compound with a water solubility of 26.5 mg/mL at 37°C. It is freely soluble in 1N HCl (300 mg/mL at 25°C) and less soluble in chloroform (3 mg/mL at 25°C).
Chlorthalidone is 2-Chloro-5-(1-hydroxy-3-oxo-1-isoindolinyl)benzenesulfonamide. Chlorthalidone has a water solubility of 12 mg/100 mL at 20°C. It has the following structural formula:
Structural Formula of Chlorthalidone
C14H11ClN2O4S M.W. 338.77
Each atenolol and chlorthalidone tablet 50 mg-25 mg for oral administration contains: atenolol USP, 50 mg and chlorthalidone USP, 25 mg.
Each atenolol and chlorthalidone tablet 100 mg-25 mg for oral administration contains: atenolol USP, 100 mg and chlorthalidone USP, 25 mg.
Atenolol and Chlorthalidone Tablets USP, 50 mg-25 mg and 100 mg-25 mg, contain the following inactive ingredients: magnesium stearate, microcrystalline cellulose, povidone and sodium starch glycolate.
INDICATIONS AND USAGE
id: b9d7c085-e844-44df-a7f1-d8ca74f56850
displayName: INDICATIONS & USAGE SECTION
FDA Article Code: 34067-9
Atenolol and chlorthalidone tablets are indicated in the treatment of hypertension. This fixed dose combination drug is not indicated for initial therapy of hypertension. If the fixed dose combination represents the dose appropriate to the individual patient’s needs, it may be more convenient than the separate components.
CONTRAINDICATIONS
id: c5ecb591-6bb5-4ebd-b88f-151f33e91e61
displayName: CONTRAINDICATIONS SECTION
FDA Article Code: 34070-3
Atenolol and chlorthalidone tablets are contraindicated in patients with: sinus bradycardia; heart block greater than first degree; cardiogenic shock; overt cardiac failure (see
WARNINGS
); anuria; hypersensitivity to this product or to sulfonamide-derived drugs.
ADVERSE REACTIONS
id: 92944d75-87c8-45b5-9c89-7e3f60910945
displayName: ADVERSE REACTIONS SECTION
FDA Article Code: 34084-4
Atenolol and chlorthalidone tablets are usually well tolerated in properly selected patients. Most adverse effects have been mild and transient. The adverse effects observed for atenolol and chlorthalidone are essentially the same as those seen with the individual components.
POTENTIAL ADVERSE EFFECTS
id: 8e17b29c-a14e-4d01-a2f4-25ca18a10240
displayName: SPL UNCLASSIFIED SECTION
FDA Article Code: 42229-5
In addition, a variety of adverse effects not observed in clinical trials with atenolol but reported with other beta-adrenergic blocking agents should be considered potential adverse effects of atenolol.
Nervous System: Reversible mental depression progressing to catatonia; an acute reversible syndrome characterized by disorientation for time and place, short-term memory loss, emotional lability, slightly clouded sensorium, and decreased performance on neuropsychometrics.
Cardiovascular: Intensification of AV block (see
CONTRAINDICATIONS
).
Gastrointestinal: Mesenteric arterial thrombosis, ischemic colitis.
Hematologic: Agranulocytosis.
Allergic: Erythematous rash, fever combined with aching and sore throat, laryngospasm and respiratory distress.
OVERDOSAGE
id: bb2a5474-3a2b-4d6e-bcad-a82d8ce2f0bd
displayName: OVERDOSAGE SECTION
FDA Article Code: 34088-5
No specific information is available with regard to overdosage and atenolol and chlorthalidone in humans. Treatment should be symptomatic and supportive and directed to the removal of any unabsorbed drug by induced emesis, or administration of activated charcoal. Atenolol can be removed from the general circulation by hemodialysis. Further consideration should be given to dehydration, electrolyte imbalance and hypotension by established procedures.
DOSAGE AND ADMINISTRATION
id: 6b62f7e0-16a4-492c-85b9-7d9e255c018b
displayName: DOSAGE & ADMINISTRATION SECTION
FDA Article Code: 34068-7
DOSAGE MUST BE INDIVIDUALIZED (SEE
INDICATIONS AND USAGE
): Chlorthalidone is usually given at a dose of 25 mg daily; the usual initial dose of atenolol is 50 mg daily. Therefore, the initial dose should be one atenolol and chlorthalidone 50 mg-25 mg tablet given once a day. If an optimal response is not achieved, the dosage should be increased to one atenolol and chlorthalidone 100 mg-25 mg tablet given once a day.
When necessary, another antihypertensive agent may be added gradually beginning with 50% of the usual recommended starting dose to avoid an excessive fall in blood pressure.
Since atenolol is excreted via the kidneys, dosage should be adjusted in cases of severe impairment of renal function. No significant accumulation of atenolol occurs until creatinine clearance falls below 35 mL/min/1.73 m2 (normal range is 100-150 mL/min/1.73 m2); therefore, the following maximum dosages are recommended for patients with renal impairment.
|
Creatinine Clearance
|
Atenolol Elimination
|
|
|
(mL/min/1.73 m2)
|
Half-life (hrs)
|
Maximum Dosage
|
|
15-35
|
16-27
|
50 mg daily
|
|
<15
|
>27
|
50 mg every other day
|
HOW SUPPLIED
id: 9cbfaa2b-1744-46d6-91e7-424d047fb662
displayName: HOW SUPPLIED SECTION
FDA Article Code: 34069-5
Atenolol and Chlorthalidone Tablets USP, 50 mg-25 mg are 10/32”, scored, round, white tablets imprinted DAN 5782 supplied in
Bottles of 30 – 68788-9042-3
Bottles of 60 – 68788-9042-6
Bottles of 90 – 68788-9042-9
Bottles of 100 – 68788-9042-1
Bottles of 120 – 68788-9042-8
Dispense in a well-closed, light-resistant container with a child-resistant closure.
Store at 20°-25°C (68°-77°F). [See USP controlled room temperature.]
Protect from heat, light and moisture.
Manufactured by:
Watson Pharma Private Ltd.
Verna, Salcette Goa 403 722 INDIA
Distributed by:
Watson Pharma, Inc.
Corona, CA 92880 USA
Revised: June 2009 190808
0609B
Repackaged by:
Preferred Pharmaceuticals, Inc
Anaheim, CA 92807
PRINCIPAL DISPLAY PANEL
id: fb85e560-cca4-476b-8211-98546a2a8165
displayName: PACKAGE LABEL.PRINCIPAL DISPLAY PANEL
FDA Article Code: 51945-4
Atenolol and Chlorthalidone Tablets USP
50mg/25mg
Rx only
