Midodrine: Orthostatic Hypotension, Safety and Interactions

What midodrine treats

Midodrine is an oral medicine whose active metabolite stimulates peripheral alpha-1 receptors and tightens blood vessels. The reviewed UK tablet is licensed for adults with severe orthostatic hypotension caused by autonomic dysfunction when correctable causes have been excluded and other treatments are insufficient. Blood pressure falls on standing.

The US information similarly reserves treatment for patients substantially impaired despite standard care. A rise in standing blood pressure alone is not the entire goal: continuing treatment should depend on meaningful improvement in symptoms and daily function.

The main risk is high blood pressure while lying down

Midodrine can produce marked supine hypertension, meaning excessive blood pressure when lying flat. Sitting blood pressure may also increase. Regular lying and standing measurements are essential. Product instructions arrange treatment around daytime activity and keep administration away from bedtime; the personal timing plan should come from the prescribing team.

Pounding in the ears, awareness of the heartbeat, headache or blurred vision can signal excessive blood pressure and require prompt medical advice. A slow pulse, fainting or new difficulty passing urine also needs assessment. Commonly described effects include goosebumps, scalp itching or tingling, and urinary discomfort. Serious heart disease, acute or severe kidney problems, urinary retention and certain endocrine disorders can preclude treatment, depending on the local product label. The US contraindications specifically include pheochromocytoma and thyrotoxicosis.

Interactions and pregnancy considerations

Decongestants and other blood-vessel-constricting products, such as pseudoephedrine or phenylephrine, may increase the risk of hypertension. The UK label also warns about other sympathomimetic medicines and MAO inhibitors. Beta blockers, digoxin and other medicines that slow the heart need assessment because reflex slowing of the pulse may be amplified.

Alpha blockers can oppose its blood-pressure effect, while fludrocortisone may require closer monitoring of blood pressure and related risks. The UK product is not recommended during pregnancy and should not be used during breastfeeding; insufficient human information must not be mistaken for reassurance.

Sources

• Zentiva Midodrine 5 mg tablets — UK SmPC — UK text revised 15 March 2023
• Midodrine hydrochloride tablets — US DailyMed label — US label effective 27 January 2023

Sources checked on 30 October 2026. This date records a source check, not a clinical review by a doctor or pharmacist. Follow the leaflet supplied with your product and consult a qualified healthcare professional about personal treatment.