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UNIT- II
Drugs acting on Autonomic nervous system
❖Adrenergic Antagonists Classification
Dr. P. Parthiban
Professor
Vellalar college of Pharmacy
Adrenergic antagonist
An adrenergic antagonist is a drug that inhibits the function
of adrenergic receptors.
Phenoxybenzamine
This medication is used to treat high blood
pressure and heavy sweating due to a
certain tumor of the adrenal glands
(pheochromocytoma). Phenoxybenzamine
belongs to a class of drugs known as alpha
blockers. It works by relaxing and widening
blood vessels so that blood can flow more
easily.
Prazosin is used with or without
other medications to treat high blood
pressure. Lowering high blood
pressure helps prevent strokes, heart
attacks, and kidney problems. Prazosin
belongs to a class of medications called
alpha blockers. It works by relaxing and
widening blood vessels so blood can flow
more easily.
Prazosin
Dihydroergotamine is in a group of drugs
called ergot alkaloids . It works by narrowing
the blood vessels around the brain and
affects blood flow patterns that are
associated with certain types of headaches.
Dihydroergotamine injection is used to treat
a migraine or cluster headache attack.
Dihydroergotamine
Methysergide is used exclusively to treat episodic
and chronic migraine and for episodic and chronic
cluster headaches. Methysergide is one of the
most effective medications for the prevention
of migraine, but is not intended for
the treatment of an acute attack, it is to be taken
daily as a preventative medication.
Methysergide
Propranolol
Propranolol is used to treat tremors, angina
(chest pain), hypertension (high blood
pressure), heart rhythm disorders, and
other heart or circulatory conditions. It is
also used to treat or prevent heart attack,
and to reduce the severity and frequency of
migraine headaches.
Metipranolol
Ophthalmic metipranolol is used to
treat glaucoma, a condition in which increased
pressure in the eye can lead to gradual loss of
vision. Metipranolol is in a class
of medications called beta-blockers. It works by
decreasing the pressure in the eye.
Atenolol Betaxolol
Atenolol is used with or without other
medications to treat high blood
pressure (hypertension). Lowering high blood
pressure helps prevent strokes, heart attacks,
and kidney problems. This medication is also
used to treat chest pain (angina) and to improve
survival after a heart attack.
Ophthalmic betaxolol is used to
treat glaucoma, a condition in which increased
pressure in the eye can lead to gradual loss of
vision. Betaxolol is in a class
of medications called beta blockers. It works
by decreasing the pressure in the eye.
Bisoprolol Esmolol
Bisoprolol is used with or without
other medications to treat high blood
pressure (hypertension). Lowering high blood
pressure helps prevent strokes, heart attacks,
and kidney problems. This medication belongs
to a class of drugs known as beta blockers.
Esmolol is used to control rapid heart beats
or abnormal heart rhythms. This medicine is
also used to treat fast heartbeat and
high blood pressure during surgery,
after surgery, or during other medical
procedures.
Labetalol
Labetalol is used with or without
other medications to treat high blood
pressure (hypertension). Lowering high
blood pressure helps prevent strokes,
heart attacks, and kidney problems.
This medication is both an alpha blocker
and beta blocker.
Metoprolol is a beta-blocker that affects the
heart and circulation (blood flow through
arteries and veins). Metoprolol is used to treat
angina (chest pain) and hypertension (high
blood pressure). Metoprolol is also used to
lower your risk of death or needing to be
hospitalized for heart failure.
Metoprolol
Carvedilol is a beta-blocker. Beta-
blockers affect the heart and circulation
(blood flow through arteries and veins).
Carvedilol is used to treat heart
failure and hypertension (high blood
pressure). It is also used after a heart
attack that has caused your heart not to
pump as well.
Carvedilol
Phentolamine is a synthetic imidazoline
with alpha-adrenergic antagonist activity.
As a competitive alpha-adrenergic
antagonist, phentolamine binds to alpha-
1 and alpha-2 receptors, resulting in a
decrease in peripheral vascular
resistance and vasodilatation.
Phentolamine
Tolazoline
Tolazoline is a non-selective competitive α-adrenergic
receptor antagonist. It is a vasodilator that is used to
treat spasms of peripheral blood vessels.
Thank you

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Adrenergic Antagonist (Blockers)

  • 1. UNIT- II Drugs acting on Autonomic nervous system ❖Adrenergic Antagonists Classification Dr. P. Parthiban Professor Vellalar college of Pharmacy
  • 2. Adrenergic antagonist An adrenergic antagonist is a drug that inhibits the function of adrenergic receptors.
  • 3.
  • 4. Phenoxybenzamine This medication is used to treat high blood pressure and heavy sweating due to a certain tumor of the adrenal glands (pheochromocytoma). Phenoxybenzamine belongs to a class of drugs known as alpha blockers. It works by relaxing and widening blood vessels so that blood can flow more easily. Prazosin is used with or without other medications to treat high blood pressure. Lowering high blood pressure helps prevent strokes, heart attacks, and kidney problems. Prazosin belongs to a class of medications called alpha blockers. It works by relaxing and widening blood vessels so blood can flow more easily. Prazosin
  • 5. Dihydroergotamine is in a group of drugs called ergot alkaloids . It works by narrowing the blood vessels around the brain and affects blood flow patterns that are associated with certain types of headaches. Dihydroergotamine injection is used to treat a migraine or cluster headache attack. Dihydroergotamine Methysergide is used exclusively to treat episodic and chronic migraine and for episodic and chronic cluster headaches. Methysergide is one of the most effective medications for the prevention of migraine, but is not intended for the treatment of an acute attack, it is to be taken daily as a preventative medication. Methysergide
  • 6. Propranolol Propranolol is used to treat tremors, angina (chest pain), hypertension (high blood pressure), heart rhythm disorders, and other heart or circulatory conditions. It is also used to treat or prevent heart attack, and to reduce the severity and frequency of migraine headaches. Metipranolol Ophthalmic metipranolol is used to treat glaucoma, a condition in which increased pressure in the eye can lead to gradual loss of vision. Metipranolol is in a class of medications called beta-blockers. It works by decreasing the pressure in the eye.
  • 7. Atenolol Betaxolol Atenolol is used with or without other medications to treat high blood pressure (hypertension). Lowering high blood pressure helps prevent strokes, heart attacks, and kidney problems. This medication is also used to treat chest pain (angina) and to improve survival after a heart attack. Ophthalmic betaxolol is used to treat glaucoma, a condition in which increased pressure in the eye can lead to gradual loss of vision. Betaxolol is in a class of medications called beta blockers. It works by decreasing the pressure in the eye.
  • 8. Bisoprolol Esmolol Bisoprolol is used with or without other medications to treat high blood pressure (hypertension). Lowering high blood pressure helps prevent strokes, heart attacks, and kidney problems. This medication belongs to a class of drugs known as beta blockers. Esmolol is used to control rapid heart beats or abnormal heart rhythms. This medicine is also used to treat fast heartbeat and high blood pressure during surgery, after surgery, or during other medical procedures.
  • 9. Labetalol Labetalol is used with or without other medications to treat high blood pressure (hypertension). Lowering high blood pressure helps prevent strokes, heart attacks, and kidney problems. This medication is both an alpha blocker and beta blocker. Metoprolol is a beta-blocker that affects the heart and circulation (blood flow through arteries and veins). Metoprolol is used to treat angina (chest pain) and hypertension (high blood pressure). Metoprolol is also used to lower your risk of death or needing to be hospitalized for heart failure. Metoprolol
  • 10. Carvedilol is a beta-blocker. Beta- blockers affect the heart and circulation (blood flow through arteries and veins). Carvedilol is used to treat heart failure and hypertension (high blood pressure). It is also used after a heart attack that has caused your heart not to pump as well. Carvedilol Phentolamine is a synthetic imidazoline with alpha-adrenergic antagonist activity. As a competitive alpha-adrenergic antagonist, phentolamine binds to alpha- 1 and alpha-2 receptors, resulting in a decrease in peripheral vascular resistance and vasodilatation. Phentolamine
  • 11. Tolazoline Tolazoline is a non-selective competitive α-adrenergic receptor antagonist. It is a vasodilator that is used to treat spasms of peripheral blood vessels.