Related Experiment Video
Updated: Aug 7, 2026

Testing Acetylcholine Followed by Adenosine for Invasive Diagnosis of Coronary Vasomotor Disorders
Published on: February 3, 2021
Comparison of indoramin and methyldopa in hypertension
Abstract:
A comparison of indoramin and methyldopa in the treatment of mild and moderate essential hypertension in 31 White middle-aged patients was made by means of a double-blind crossover trial. Equally satisfactory control of systolic and diastolic blood pressure, in the standing and supine positions, was achieved by both drugs. With a mean dose of 158 +/- 9 mg per day of indoramin the average fall in lying and standing blood pressures was 16/6 and 16/8 mmHg respectively. Equivalent values for methyldopa, with a mean dose of 1 540 +/- 90 mg per day, were 21/8 and 16/13 mmHg. Values for the two drugs are not significantly different. Also, there were no significant differences between the two drugs in their effect on the heart rate or in the incidence of side-effects.
Related Concept Videos
Adrenergic Agonists: Direct-Acting Agents
These agents can be classified...
Adrenergic Agonists: Indirect-Acting Agents
One mechanism involves depleting stored catecholamines by displacing them from synaptic vesicles. These agents, known as "displacers," are transported into vesicles at the expense of noradrenaline. Examples include amphetamine and tyramine, which lack a catechol moiety, resulting in prolonged action, improved oral bioavailability, and...
Adrenergic Agonists: Mixed-Action Agents
Ephedrine and pseudoephedrine lack a catecholamine group, making them less susceptible to degradation by metabolic enzymes. They have increased oral bioavailability and lipophilicity, resulting in a longer duration of action. Their response is reduced by...
Adrenergic Antagonists: ɑ and β-Receptor Blockers
Antihypertensive Drugs: Vasodilators
Antiasthma Drugs: Methylxanthines
Theophylline is thought to inhibit phosphodiesterase enzymes, increasing intracellular levels of cyclic adenosine monophosphate (cAMP) and cyclic guanosine monophosphate (cGMP). This rise in cAMP and cGMP concentrations stimulates cardiac function,...

