A Phase 4 interventional study of Memantine and Gabapentin in Pendular Nystagmus and Oculopalatal Tremor, sponsored by Hospices Civils de Lyon. Completed at 1 site in France. Open to participants aged 18 Years and older. Per ClinicalTrials.gov, last updated 2025-09-03.
Sponsored by Hospices Civils de Lyon · Phase 4, Interventional, and Treatment
Pendular nystagmus corresponds to an enduring to and fro eye oscillation without resetting quick phases. The most common causes of acquired pendular nystagmus (APN) are multiple sclerosis (MS) and focal brainstem lesions (oculopalatal tremor, OPT). Based on pathophysiological hypothesis, pharmacological treatments of acquired nystagmus have been thoroughly proposed over different publications of cases, series, reviews or expert opinions. Acquired pendular nystagmus underwent the most rigorous treatment trials, leading to the proposal of gabapentin or memantine as valuable drugs. Whether gabapentin and memantine are effective in APN associated with OPT remains unclear, since none of the previous studies has evaluated the effect of these medications in a group of OPT patients. However, this is an important issue in prospect to a clinical use of these medications. In the current study, the investigators aim is to evaluate the effect of gabapentin and memantine on the mean velocity, amplitude and frequency of pendular nystagmus, as well as on visual acuity and vision-specific health-related quality of life score, in a group of OPT patients
27 studies on the registry are indexed under Nystagmus, Pathologic; 3 are open to participants now.
This study's enrollment of 7 is below the median of 48 across 17 interventional studies indexed under Nystagmus, Pathologic.
Browse Nystagmus, Pathologic studies →Hospices Civils de Lyon is the lead sponsor of 1,866 studies on the registry; 448 are open to participants now.
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Exclusion Criteria:
Ophthalmological
Neurological
Treatment
General
Underlined terms in the criteria open these too. Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Ways of preventing pregnancy. “Highly effective” methods fail less than 1% of the time a year when used correctly — for example an IUD or an implant.
Criteria usually say which methods count and how long to keep using them after the last dose, sometimes for male participants too. Some studies accept a partner’s vasectomy if it was confirmed successful and that person is the participant’s only sexual partner.
Anti-inflammatory medicines such as prednisone, prednisolone and dexamethasone — not the anabolic steroids used for muscle.
Studies differ in what they allow: check which steroid medicines, routes (tablets, injections, creams, inhalers, eye drops) and doses this study accepts.
An allergy, or another reaction of the immune system, to a substance. “Hypersensitivity to the study drug” means a known allergic reaction to it — not every side effect a medicine can have.
How quickly the kidneys clear creatinine, a waste product, from the blood. A study may estimate it from a blood test with age, weight and sex (often by the Cockcroft–Gault formula), or measure it using blood and urine collected over a set time. Given in mL/min; higher is better.
Contraception
Ways of preventing pregnancy. “Highly effective” methods fail less than 1% of the time a year when used correctly — for example an IUD or an implant.
Criteria usually say which methods count and how long to keep using them after the last dose, sometimes for male participants too. Some studies accept a partner’s vasectomy if it was confirmed successful and that person is the participant’s only sexual partner.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Corticosteroids (steroids)
Anti-inflammatory medicines such as prednisone, prednisolone and dexamethasone — not the anabolic steroids used for muscle.
Studies differ in what they allow: check which steroid medicines, routes (tablets, injections, creams, inhalers, eye drops) and doses this study accepts.
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Hypersensitivity
An allergy, or another reaction of the immune system, to a substance. “Hypersensitivity to the study drug” means a known allergic reaction to it — not every side effect a medicine can have.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Creatinine clearance (CrCl)
How quickly the kidneys clear creatinine, a waste product, from the blood. A study may estimate it from a blood test with age, weight and sex (often by the Cockcroft–Gault formula), or measure it using blood and urine collected over a set time. Given in mL/min; higher is better.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Patients will be randomly assigned to start on either memantine or gabapentin. For tolerance reasons, each treatment begins with a progressive increasing dose and stops with a progressive decreasing dose. The duration of the period of last dose (8 to 11 days) will be chosen according to the investigator's availability to organize post-tests.
Drug: Memantine
Patients will be randomly assigned to start on either memantine or gabapentin. For tolerance reasons, each treatment begins with a progressive increasing dose and stops with a progressive decreasing dose. The duration of the period of last dose (8 to 11 days) will be chosen according to the investigator's availability to organize post-tests.
Drug: Gabapentin
Velocity, amplitude and frequency of nystagmus using eye movement recording
Time frame: at Day 17-21
Velocity, amplitude and frequency of nystagmus using eye movement recording
Time frame: at Day 34-42
Velocity, amplitude and frequency of nystagmus using eye movement recording
Time frame: at Day 64-79
Velocity, amplitude and frequency of nystagmus using eye movement recording
Time frame: at Day 81-100
Functional score on questioning as measured by the 25-Item National Eye Institute Visual Function Questionnaire
Time frame: at Day 17-21
Functional score on questioning as measured by the 25-Item National Eye Institute Visual Function Questionnaire
Time frame: at Day 34-42
Functional score on questioning as measured by the 25-Item National Eye Institute Visual Function Questionnaire
Time frame: at Day 64-79
Functional score on questioning as measured by the 25-Item National Eye Institute Visual Function Questionnaire
Time frame: at Day 81-100
subjective measure of oscillopsia
Time frame: at Day 17-21
subjective measure of oscillopsia
Time frame: at Day 34-42
subjective measure of oscillopsia
Time frame: at Day 64-79
subjective measure of oscillopsia
Time frame: at Day 81-100
far visual acuity as measured by monocularly and binocularly direction and amplitude (measures in degrees) of their oscillopsia while viewing, with best correction, a stationary target at far (5 m) and near (57 cm) location.
Time frame: at Day 17-21
far visual acuity as measured by monocularly and binocularly direction and amplitude (measures in degrees) of their oscillopsia while viewing, with best correction, a stationary target at far (5 m) and near (57 cm) location.
Time frame: at Day 34-42
far visual acuity as measured by monocularly and binocularly direction and amplitude (measures in degrees) of their oscillopsia while viewing, with best correction, a stationary target at far (5 m) and near (57 cm) location.
Time frame: at Day 64-79
far visual acuity as measured by monocularly and binocularly direction and amplitude (measures in degrees) of their oscillopsia while viewing, with best correction, a stationary target at far (5 m) and near (57 cm) location.
Time frame: at Day 81-100
This study is completed, as verified in Aug 2025. You cannot join it, but the record below documents what was studied.
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Studies of the drugs tested here: Memantine · Gabapentin