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Showing 1–13 of 13 matching trials from the live ClinicalTrials.gov search.
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Filters: Intervention: Phentolamine Ophthalmic Solution Vehicle Clear all
Completed Phase 3 Interventional Accepts healthy volunteers Results available

Evaluate Efficacy and Safety of POS to Improve Distance-corrected Near Visual in Participants With Presbyopia

NCT06542497
View directory record Official record
Conditions
Presbyopia
Interventions
0.75% phentolamine ophthalmic solution, Placebo
Drug
Lead sponsor
Ocuphire Pharma, Inc.
Industry
Eligibility
45 Years to 64 Years
Enrollment
569 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2024 – 2026
U.S. locations
39
States / cities
Chandler, Arizona • Mesa, Arizona • Phoenix, Arizona + 32 more
Source: ClinicalTrials.gov public record
Updated Aug 16, 2026 · Synced Sep 27, 2026, 7:38 AM EDT
Completed Phase 3 Interventional Accepts healthy volunteers Results available

Safety and Efficacy of Nyxol (0.75% Phentolamine Ophthalmic Solution) to Reverse Pharmacologically-Induced Mydriasis (MIRA-3)

NCT05134974
View directory record Official record
Conditions
Mydriasis, Dilation
Interventions
Phentolamine Ophthalmic Solution 0.75%, Phentolamine Ophthalmic Solution Vehicle
Drug
Lead sponsor
Ocuphire Pharma, Inc.
Industry
Eligibility
12 Years and older
Enrollment
368 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2021 – 2022
U.S. locations
15
States / cities
Newport Beach, California • Westminster, California • Delray Beach, Florida + 12 more
Source: ClinicalTrials.gov public record
Updated Aug 28, 2023 · Synced Sep 27, 2026, 7:38 AM EDT
Completed Phase 2 Interventional Results available

Single Dose Study of Phentolamine Mesylate Eye Drops in Patients With Severe Night Vision Disturbances

NCT04004507
View directory record Official record
Conditions
Decrease in Night Vision, Disturbance; Vision, Loss
Interventions
Phentolamine Mesylate Ophthalmic Solution 1%, Phentolamine Mesylate Ophthalmic Solution Vehicle (Placebo)
Drug · Other
Lead sponsor
Ocuphire Pharma, Inc.
Industry
Eligibility
18 Years to 80 Years
Enrollment
24 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2007 – 2008
U.S. locations
1
States / cities
Lynbrook, New York
Source: ClinicalTrials.gov public record
Updated Feb 14, 2024 · Synced Sep 27, 2026, 7:38 AM EDT
Completed Phase 3 Interventional Accepts healthy volunteers Results available

Nyxol (0.75% Phentolamine Ophthalmic Solution) to Reverse Pharmacologically-Induced Mydriasis in Pediatric Subjects

NCT05223478
View directory record Official record
Conditions
Mydriasis, Dilation
Interventions
Phentolamine Ophthalmic Solution 0.75%, Phentolamine Ophthalmic Solution Vehicle
Drug
Lead sponsor
Ocuphire Pharma, Inc.
Industry
Eligibility
3 Years to 11 Years
Enrollment
23 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2021 – 2022
U.S. locations
2
States / cities
Longwood, Florida • Athens, Ohio
Source: ClinicalTrials.gov public record
Updated Sep 4, 2023 · Synced Sep 27, 2026, 7:38 AM EDT
Recruiting Phase 3 Interventional

OPI-NXYDLD-303 Safety and Efficacy of Phentolamine Ophthalmic Solution in Keratorefractive Surgery Participants With Decreased Mesopic Visual Acuity

NCT07140783
View directory record Official record
Conditions
Vision Loss Night, Vision Disorders
Interventions
0.75% Phentolamine Ophthalmic Solution, Placebo
Drug
Lead sponsor
Ocuphire Pharma, Inc.
Industry
Eligibility
18 Years and older
Enrollment
580 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2025 – 2027
U.S. locations
20
States / cities
Chandler, Arizona • Phoenix, Arizona • Scottsdale, Arizona + 16 more
Source: ClinicalTrials.gov public record
Updated Sep 7, 2026 · Synced Sep 27, 2026, 7:38 AM EDT
Completed Phase 2 Interventional Accepts healthy volunteers Results available

Safety and Efficacy of Ophthalmic Phentolamine Mesylate to Reverse Pharmacologically Induced Mydriasis

NCT04024891
View directory record Official record
Conditions
Mydriasis, Dilation
Interventions
Phentolamine Mesylate Ophthalmic Solution 1%, Phentolamine Mesylate Ophthalmic Solution Vehicle (Placebo)
Drug · Other
Lead sponsor
Ocuphire Pharma, Inc.
Industry
Eligibility
18 Years to 45 Years
Enrollment
32 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2019
U.S. locations
4
States / cities
Pittsburg, Kansas • Lexington, Kentucky • Athens, Ohio + 1 more
Source: ClinicalTrials.gov public record
Updated Aug 28, 2023 · Synced Sep 27, 2026, 7:38 AM EDT
Completed Phase 3 Interventional Accepts healthy volunteers Results available

Safety and Efficacy of Nyxol (0.75% Phentolamine Ophthalmic Solution) to Reverse Pharmacologically-Induced Mydriasis

NCT04620213
View directory record Official record
Conditions
Mydriasis, Dilation
Interventions
Phentolamine Ophthalmic Solution 0.75%, Phentolamine Ophthalmic Solution Vehicle (Placebo)
Drug · Other
Lead sponsor
Ocuphire Pharma, Inc.
Industry
Eligibility
12 Years and older
Enrollment
185 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2020 – 2021
U.S. locations
12
States / cities
Newport Beach, California • San Diego, California • Longwood, Florida + 9 more
Source: ClinicalTrials.gov public record
Updated Sep 10, 2023 · Synced Sep 27, 2026, 7:38 AM EDT
Completed Phase 3 Interventional Results available

Safety and Efficacy of Nyxol (0.75% Phentolamine Ophthalmic Solution) in Subjects With Dim Light Vision Disturbances

NCT04638660
View directory record Official record
Conditions
Dim Light Vision Disturbances
Interventions
Phentolamine Ophthalmic Solution 0.75%, Phentolamine Ophthalmic Solution Vehicle (Placebo)
Drug
Lead sponsor
Ocuphire Pharma, Inc.
Industry
Eligibility
18 Years and older
Enrollment
144 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2020 – 2022
U.S. locations
17
States / cities
Newport Beach, California • Petaluma, California • Jacksonville, Florida + 12 more
Source: ClinicalTrials.gov public record
Updated Oct 13, 2025 · Synced Sep 27, 2026, 7:38 AM EDT
Completed Phase 2 Interventional Results available

Safety and Efficacy of Nyxol With Pilocarpine Eye Drops in Subjects With Presbyopia

NCT04675151
View directory record Official record
Conditions
Presbyopia
Interventions
Phentolamine Ophthalmic Solution 0.75%, Pilocarpine, Placebo
Drug · Other
Lead sponsor
Ocuphire Pharma, Inc.
Industry
Eligibility
40 Years to 64 Years
Enrollment
150 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2021
U.S. locations
17
States / cities
Laguna Hills, California • Newport Beach, California • Crystal River, Florida + 14 more
Source: ClinicalTrials.gov public record
Updated Oct 9, 2025 · Synced Sep 27, 2026, 7:38 AM EDT
Completed Phase 3 Interventional Results available

Safety and Efficacy of 0.75% Phentolamine Ophthalmic Solution in Subjects With Post-refractive Surgery Visual Disturbances

NCT06349759
View directory record Official record
Conditions
Mesopic Vision, Night Vision Loss
Interventions
phentolamine ophthalmic solution 0.75%, a non-selective alpha-1 and alpha-2 adrenergic antagonist, Placebo
Drug
Lead sponsor
Ocuphire Pharma, Inc.
Industry
Eligibility
18 Years and older
Enrollment
200 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2024 – 2026
U.S. locations
25
States / cities
Pheonix, Arizona • Scottsdale, Arizona • Bakersfield, California + 20 more
Source: ClinicalTrials.gov public record
Updated Aug 17, 2026 · Synced Sep 27, 2026, 7:38 AM EDT
Completed Phase 2 Interventional Accepts healthy volunteers

The Safety and Efficacy of Phentolamine Mesylate Ophthalmic Solution in Subjects With Severe Night Vision Disturbances

NCT01703559
View directory record Official record
Conditions
Night Vision Complaints, Decrease in Night Vision, Disturbance; Vision, Loss
Interventions
Phentolamine Mesylate Ophthalmic Solution 1.0%, Phentolamine Mesylate Ophthalmic Solution 0.5%, Phentolamine Mesylate Ophthalmic Solution Vehicle (Placebo)
Drug · Other
Lead sponsor
Ocuphire Pharma, Inc.
Industry
Eligibility
18 Years to 45 Years
Enrollment
60 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2011 – 2012
U.S. locations
1
States / cities
Phoenix, Arizona
Source: ClinicalTrials.gov public record
Updated Jul 31, 2019 · Synced Sep 27, 2026, 7:38 AM EDT
Completed Phase 2 Interventional Results available

Safety and Efficacy of Ophthalmic Phentolamine Mesylate in Glaucoma

NCT03960866
View directory record Official record
Conditions
Open Angle Glaucoma, Ocular Hypertension
Interventions
Phentolamine Mesylate Ophthalmic Solution 1%, Phentolamine Mesylate Ophthalmic Solution Vehicle (Placebo)
Drug · Other
Lead sponsor
Ocuphire Pharma, Inc.
Industry
Eligibility
18 Years and older
Enrollment
39 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2019
U.S. locations
5
States / cities
Mission Hills, California • Morrow, Georgia • Ann Arbor, Michigan + 2 more
Source: ClinicalTrials.gov public record
Updated Sep 12, 2023 · Synced Sep 27, 2026, 7:38 AM EDT
Completed Phase 3 Interventional Results available

Safety and Efficacy of Nyxol Eye Drops as a Single Agent and With Adjunctive Low-Dose Pilocarpine Eye Drops in Subjects With Presbyopia

NCT05646719
View directory record Official record
Conditions
Presbyopia
Interventions
Phentolamine Opthalmic Solution 0.75%, Placebo, Low dose pilocarpine, Low dose pilocarpine vehicle
Drug · Other
Lead sponsor
Ocuphire Pharma, Inc.
Industry
Eligibility
40 Years to 64 Years
Enrollment
333 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2022 – 2023
U.S. locations
26
States / cities
Phoenix, Arizona • Azusa, California • Newport Beach, California + 23 more
Source: ClinicalTrials.gov public record
Updated Jul 12, 2026 · Synced Sep 27, 2026, 7:38 AM EDT