Benidin M

Benidin M Uses, Dosage, Side Effects, Food Interaction and all others data.

Benidipine has the formula 1,4-dihydro-2,6-dimethyl-4-(3-nitrophenyl)-3,5-pyridine-dicarboxylic acid methyl 1-(phenylmethyl)-3-piperidinyl ester hydrochloride. It is a synthetic dihydropyridine derivative that has anti-hypertensive and anti-anginal actions. It was originated in Japan by Kyowa Hakko, it is submitted for FDA approval and it is currently available in some Asian countries like India and Japan.

Benidipine reduces systolic and diastolic blood pressure as well as to present decreases in heart rate pulse after treatment. It is reported also a decrease urinary protein excretion and serum triglycerides. Different studies have shown benidipine anti-oxidative activity, stimulation of NO production, suppression of adhesion molecules expression, stimulation of osteoblast differentiation, suppression of the proliferation of vascular smooth muscle cells and mesangial cells, as well as myocardial protection. The enhancement of NO production is associated with the cardioprotective and antiartheriosclerotic effects of benidipine.

Metoprolol is a selective beta1-blocker. Metoprolol reduces or inhibits the agonistic effect on the heart of catecholamines (which are released during physical and mental stress). This means that the usual increase in heart rate, cardiac output, cardiac contractility and blood pressure, produced by the acute increase in catecholamines, is reduced by Metoprolol. Metoprolol interferes less with Insulin release and carbohydrate metabolism than do non-selective beta-blockers. Metoprolol interferes much less with the cardiovascular response to hypoglycaemia than do non-selective beta-blockers.

Administration of metoprolol in normal subjects is widely reported to produce a dose-dependent reduction on heart rate and cardiac output. This effect is generated due to a decreased cardiac excitability, cardiac output, and myocardial oxygen demand. In the case of arrhythmias, metoprolol produces its effect by reducing the slope of the pacemaker potential as well as suppressing the rate of atrioventricular conduction.

The Metoprolol Atherosclerosis Prevention in Hypertensives (MAPHY) trial showed a significant improvement in sudden cardiac death and myocardial infarction when patients were given with metoprolol as compared with diuretics. As well, in clinical trials performed in 1990, metoprolol reduces mortality and re-infarction in 17% of the individuals when administered chronically after an episode of myocardial infarction.

Trade Name Benidin M
Generic Benidipine + Metoprolol
Weight 4mg
Type Tablet
Therapeutic Class
Manufacturer Lloyd Healthcare Pvt Ltd
Available Country India
Last Updated: September 19, 2023 at 7:00 am
Benidin M
Benidin M

Uses

Benidipine is a synthetic dihydropyridine calcium channel blocker used to treat hypertension and angina pectoris.

Benidipine is a potent and long-lasting drug indicated for the treatment of cardiovascular diseases such as hypertension, renoparenchymal hypertension and angina pectoris.

ln the management of hypertension and angina pectoris. Cardiac arrhythmias, especially supraventricular tachyarrhythmias. Adjunct to the treatment of hyperthyroidism. Early intervention with Metoprolol in acute myocardial infarction reduces infarct size and the incidence of ventricular fibrillation. Pain relief may also decrease the need for opiate analgesics. Metoprolol has been shown to reduce mortality when administered to patients with acute myocardial infarction.

Benidin M is also used to associated treatment for these conditions: Angina Pectoris, High Blood Pressure (Hypertension), Hypertension, Renal, Renal parenchymal hypertensionAngina Pectoris, Atrial Fibrillation, High Blood Pressure (Hypertension), Migraine, Myocardial Infarction, Tachycardia, Supraventricular, Thyroid Crisis, Acute hemodynamically stable Myocardial infarction, Chronic heart failure with reduced ejection fraction (NYHA Class II), Chronic heart failure with reduced ejection fraction (NYHA Class III)

How Benidin M works

Benidipine is a tripe calcium channel inhibitor by inhibiting L, N and T type calcium channel. It presents a very long-lasting activity that can be explained by its high affinity for cell membranes from the DHP binding site; this characteristic indicated a long-lasting pharmacological activity of benidipine. The additional property of benidipine is the vascular selectivity towards peripheral blood vessels.

Metoprolol is a beta-1-adrenergic receptor inhibitor specific to cardiac cells with negligible effect on beta-2 receptors. This inhibition decreases cardiac output by producing negative chronotropic and inotropic effects without presenting activity towards membrane stabilization nor intrinsic sympathomimetics.

Dosage

Benidin M dosage

Oral-

Hypertension: Total daily dosage Metoprolol 100-400 mg to be given as a single or twice daily dose. The starting dose is 100 mg (two Metoprolol-50 tablets) per day. This may be increased by 100 mg per day at weekly intervals. lf full control is not achieved using a single daily dose, a b.i.d. regimen should be initiated. Combination therapy with a diuretic or other anti-hypertensive agent may also be considered.

Angina: Usually Metoprolol 50 mg (one Metoprolol-50 tablet) to 100 mg (two Metoprolol-50 tablets)twice or three times daily.

Cardiac arrhythmias: Metoprolol 50 mg (one Metoprolol-50 tablet) b.i.d or t.i.d should usually control the condition. It necessary the dose can be increased up to 300 mg per day in divided doses. Following the treatment of an acute arrhythmia with Metoprolol injection, continuationtherapy with Metoprolol tablets should be initiated 4-6 hours later. The initial oral dose should not exceed 50 mg t.i.d.

Hyperthyroidism: Metoprolol 50 mg (one Metoprolol-50 tablet) four times a day.The dose should bereduced as the euthyroid state is achieved.

Myocardial infarction: Orally, therapy should commence 15 minutes after the last injection with50 mg every 6 hours for 48 hours. Patients who fail to tolerate the full intravenous dose should begiven half the suggested oral dose. Maintenance – The usual maintenance dose is 200 mg dailygiven in divided doses. Elderly’ There are no special dosage requirements in otherwise healthyelderly patients. Signidcant hepatic dysfunction: A reduction in dosage may be necessary.

Injection-

Arrhythmias: By intravenous injection, up to 5 mg at a rate of 1-2 mg/minute, repeated after 5 minutes if necessary, total dose 10-15 mg.

In surgery: By slow intravenous injection 2-4 mg at induction or to control arrhythmias developing during anaesthesia; 2 mg doses may be repeated to a maximum of 10 mg.

Myocardial Infarction: Early intervention within 12 hours of infarction, by intravenous injection 5 mg every 2 minutes to a maximum of 15 mg, followed after 15 minutes by 50 mg by mouth every 6 hours for 48 hours; maintenance 200 mg daily in divided doses.

Impaired Renal Function: Dose adjustment is not needed in patients with impaired renal function.

Impaired Hepatic Function: Dose adjustment is not normally needed in patients suffering from liver cirrhosis because Metoprolol has low protein binding (5-10%). When there are signs of serious impairment of liver function (e.g. shunt-operated patients), a reduction in dose should be considered.

Elderly: Dose adjustment is not needed.

Side Effects

Bradycardia, bronchospasm, hypotension, headache, fatigue, sleep & gastro-intestinal disturbances, dizziness, vertigo, visual disturbances etc.

Toxicity

In preclinical studies, the LD50 of benidipine ranged from 87-384 mg/kg which is more than 100 times the needed dose to achieve anti-hypertensive action. There were no significant changes in histopathological heart examination. Benidipine showed no carcinogenic, antigenicity, teratogenic or mutagenic properties.

Oral administration of metoprolol to rats presents an LD50 in the range of 3090 to 4670 mg/kg. Cases of overdose have reported bradycardia, hypotension, bronchospasm, and cardiac failure. In the case of an overdose, gastric lavage is recommended followed by specific treatment according to symptoms.

Metoprolol is not reported to be carcinogenic nor mutagenic nor to impair fertility. The only event registered is the increase of macrophages in pulmonary alveoli and slight biliary hyperplasia. When metoprolol was given for long periods of time on the highest dose, there was evidence of small benign lung tumors.

Precaution

The second or third dose should not be given if the heart rate is <40 beats/minute, the P-R interval is > 0.26 seconds and the systolic blood pressure is <90 mmHg or if there is any aggravation of dyspnoea or cold sweating. Intravenous administration of calcium antagonists of the Verapamil-type should not be given to patients treated with beta-blockers. When treating patients with suspected or definite myocardial infarction, the haemodynamic status of the patient should be carefully monitored after each of the three 5 mg intravenous doses. Use in Pregnancy: As with most medicines, Metoprolol should not be given during pregnancy and lactation unless its use is considered essential. As with all antihypertensive agents, beta-blockers may cause side effects (e.g. bradycardia) in the foetus and in the newborn and breast-fed infant. Use in Lactation: The amount of Metoprolol ingested via breast-milk seems to be negligible as regards beta-blocking effect in the infant if the mother is treated with Metoprolol doses within the normal therapeutic range.

Interaction

Plasma level of Metoprolol may be raised by co-administration of compounds metabolished by CYP2D6 e.g. Antiarrhythmics, antihistamines, H2 receptor antagonists, antidepressants, antipsychotics and COX-2 inhibitors. The plasma conc. of Metoprolol is lowered by Rifampicin.

Volume of Distribution

Benidipine is highly distributed to the tissues mainly in the liver and kidneys and plasma. It does not present a high accumulation following repeated oral administrations.

The reported volume of distribution of metoprolol is 4.2 L/kg. Due to the characteristics of metoprolol, this molecule is able to cross the blood-brain barrier and even 78% of the administered drug can be found in cerebrospinal fluid.

Elimination Route

Benidipine is rapidly absorbed after oral administration reaching a maximum concentration within 2 hours. The short period of time needed for maximum concentration to get reached is a particular characteristic of benidipine when compared with other calcium channel blockers. The registered maximum concentration and AUC are dose-dependent and it can go from 0.55-3.89 ng/ml and 1.04-6.7 ng.h/ml respectively when administered in a dose of 2-8 mg.

When metoprolol is administered orally, it is almost completely absorbed in the gastrointestinal tract. The maximum serum concentration is achieved 20 min after intravenous administration and 1-2 hours after oral administration. The bioavailability of metoprolol is of 100% when administered intravenously and when administered orally it presents about 50% for the tartrate derivative and 40% for the succinate derivative.

The absorption of metoprolol in the form of the tartrate derivative is increased by the concomitant administration of food.

Half Life

The elimination half-life of benidipine is registered to be of approximate 1 hour.

The immediate release formulations of metoprolol present a half-life of about 3-7 hours.

Clearance

The reported clearance rate on patients with normal kidney function is 0.8 L/min. In cirrhotic patients, the clearance rate changes to 0.61 L/min.

Elimination Route

The percentage of urinary excretion after oral administration is of approximate 36% of the administered dose. Most of the remaining dose is excreted in feces, making bile excretion the major elimination pathway of benidipine. From the eliminated drug, none of it is expressed in the form of the unchanged drug.

Metoprolol is mainly excreted via the kidneys. From the eliminated dose, less than 5% is recovered unchanged.

Pregnancy & Breastfeeding use

Metoprolol should not be used in pregnancy or lactating mothers unless the physician considers that the benefit outweighs the possible hazard to the fetus or infant.

Contraindication

2nd or 3rd degree AV block, sick sinus syndrome, hypotension, decompensated heart failure, sinus bradycardia, severe peripheral arterial circulatory disorders, cardiogenic shock, severe asthma and bronchospasm, untreated phaeochromocytoma, Prinzmetal's angina, metabolic acidosis.

Special Warning

Renal Impairment: No dosage adjustment needed.

Hepatic Impairment: Reduce dose.

Acute Overdose

Poisoning due to an overdose of metoprolol may lead to severe hypotension, sinus bradycardia, atrioventricular block, heart failure, cardiogenic shock, cardiac arrest, bronchospasm, impairment of consciousness, coma, nausea, vomiting, cyanosis, hypoglycaemia and, occasionally, hyperkalaemia. The first manifestations usually appear 20 minutes to 2 hours after drug ingestion. Treatment: Treatment should include close monitoring of cardiovascular, respiratory and renal function, and blood glucose and electrolytes. Further absorption may be prevented by induction of vomiting, gastric lavage or administration of activated-charcoal if ingestion is recent. Cardiovascular complications should be treated symptomatically, which may require the use of sympathomimetic agents (e.g. noradrenaline, metaramionl), atropine or inotropic agents (e.g. dopamine, dobutamine). Temporary pacing may be required for AV block. Glucagon can reverse the effects of excessive B-blockade, given in a dose of 1-10 mg intravenously. Intravenous B2-stimulants e.g. terbutaline may be required to relieve bronchospasm. Metoprolol cannot be effectively removed by haemodialysis.

Storage Condition

Store in a cool, dry place protected from light. Keep out of reach of children.

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