Midodrine is an alpha-1 adrenergic agonist used to treat orthostatic hypotension. It works by stimulating alpha-1 receptors in vascular smooth muscle, causing the blood vessels to narrow. This vasoconstriction increases peripheral resistance and raises arterial blood pressure. The subsequent rise in pressure helps prevent dizziness, light-headedness, and fainting when standing. Midodrine is taken orally and is converted in the body to desglymidine, which also contributes to its vasoconstrictive effect. The drug's primary therapeutic purpose is to improve standing tolerance by maintaining adequate blood pressure during upright posture.

Midodrine is a synthetic medication used to raise blood pressure in patients with orthostatic hypotension. It belongs to a class of drugs called vasoconstrictors that act on the peripheral vascular system. The drug works by stimulating alpha-adrenergic receptors on vascular smooth muscle causing the vessels to narrow. This constriction reduces capillary pooling of blood during upright posture improving cerebral perfusion. After oral administration the drug is metabolized by the liver into an active form that further stimulates vascular receptors. The resulting increase in vascular tone helps maintain adequate blood pressure when standing or sitting upright. This therapeutic effect reduces symptoms such as dizziness and fainting associated with orthostatic hypotension.

Some patients experience tingling or numbness in the arms and legs. Dry mouth or throat irritation may occur. Headaches are reported in a minority of users. Elevated blood pressure can lead to dizziness or palpitations. Gastrointestinal discomfort such as nausea or abdominal cramps may happen. Swelling in the lower limbs sometimes develops after prolonged use. Vision disturbances like blurred sight have been noted in rare cases.

Common side effects include headache, nausea, and dizziness that may improve over time. Some patients may experience difficulty sleeping or a feeling of restlessness. Allergic reactions such as rash or itching can occur in rare cases. Low blood pressure may lead to fainting if the medication is taken too quickly. Elevated blood pressure can cause visual disturbances like blurred vision. Rarely, the drug may cause swelling in the legs or feet. These effects usually resolve without medical intervention but should be monitored.