10 Questions
Which classification of sympathomimetics includes adrenaline, noradrenaline, isoprenaline, and dopamine?
According to chemical structure
Which type of sympathomimetic drugs act directly on α or β receptors?
Direct acting drugs
Which sympathomimetic drugs cause the release of norepinephrine from nerve endings or block the reuptake of norepinephrine?
Indirectly acting drugs
Which type of adrenergic receptors agonists may stimulate both alpha and beta receptors?
$Adrenaline$
Which sympathomimetic drug acts partly directly and partly by causing the release of norepinephrine from nerve endings?
$Ephedrine$
Which sympathomimetic drug is a noncatecholamine?
Phenylephrine
Which type of sympathomimetic drug acts partly directly and partly by causing the release of norepinephrine from nerve endings?
Ephedrine
Which sympathomimetic drug primarily acts by causing the release of norepinephrine from nerve endings or blocking the reuptake of norepinephrine?
Amphetamine
Which type of adrenergic receptors agonists may be selective or non-selective in action?
Ephedrine
Which sympathomimetic drug is a direct acting drug that acts on α or β receptors?
Isoprenaline
Study Notes
Sympathomimetic Classification
- Adrenaline, noradrenaline, isoprenaline, and dopamine are classified as catecholamines.
Direct-Acting Sympathomimetics
- Direct-acting sympathomimetic drugs act directly on α or β receptors.
- Direct-acting sympathomimetics may stimulate both alpha and beta receptors.
Indirect-Acting Sympathomimetics
- Indirect-acting sympathomimetic drugs cause the release of norepinephrine from nerve endings or block the reuptake of norepinephrine.
Mixed-Acting Sympathomimetics
- Mixed-acting sympathomimetic drugs act partly directly and partly by causing the release of norepinephrine from nerve endings.
- Examples of mixed-acting sympathomimetics include ephedrine and pseudoephedrine.
Non-Catecholamine Sympathomimetics
- Amphetamine is a noncatecholamine sympathomimetic drug.
Selective and Non-Selective Adrenergic Agonists
- Adrenergic receptors agonists may be selective or non-selective in action.
- Selective agonists stimulate only alpha or beta receptors, while non-selective agonists stimulate both.
Test your knowledge of sympathomimetic drugs with this quiz that covers their classification based on chemical structure and mechanism of action. Identify the different types of sympathomimetics and their effects.
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