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Ampreloxetine (TD-9855) is an investigational, potent, and long-acting norepinephrine reuptake inhibitor (NRI) being developed by Theravance Biopharma. It is designed for the once-daily treatment of symptomatic neurogenic orthostatic hypotension (nOH) in patients with multiple system atrophy (MSA). By selectively inhibiting the norepinephrine transporter (NET), ampreloxetine increases the levels of norepinephrine in the synaptic cleft, which helps to maintain blood pressure and reduce symptoms like dizziness and syncope when standing. The drug is currently being evaluated in the Phase 3 CYPRESS trial, following a strategic funding agreement with Royalty Pharma to support its development in the MSA subpopulation.
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