U nas zapłacisz kartą
Brymonidyna na twarz - Tajemnicze Piękno Naturalnej Pielęgnacji
Pharmacology
Brinzolamide, either as a standalone agent or in combination with brimonidine, is approved by the FDA for the treatment of elevated intraocular pressure in patients with ocular hypertension or open-angle glaucoma. 8,5 Brinzolamide is also approved in Europe to be used in combination with timolol to treat the same conditions. 7
Reduce drug development failure rates Build, train, & validate machine-learning models with evidence-based and structured datasets. Build, train, & validate predictive machine-learning models with structured datasets.Tap into our Clinical API for life-saving information on contraindications & blackbox warnings, population restrictions, harmful risks, & more.
Avoid life-threatening adverse drug events with our Clinical APIInhibition of carbonic anhydrase II (CA-II) in the ciliary process of the eye slows the formation of bicarbonate and thus fluid flow, lowering intraocular pressure (IOP). 3,4
The IOP-reducing effect of brinzolamide as adjunctive therapy to the prostaglandin analog travoprost was studied. Following a 4-week run-in with travoprost, patients with an IOP ≥19 mmHg were randomized to receive added treatment with brinzolamide or timolol. An additional decrease in mean diurnal IOP of 3.2 to 3.4 mmHg for the brinzolamide group and 3.2 to 4.2 mmHg for the timolol group were observed. There was an overall higher incidence of non-serious ocular adverse reactions, mainly related to signs of local irritation, in the brinzolamide/travoprost groups. The events were mild and did not affect the overall discontinuation rates in the studies. 11
A clinical trial was conducted with brinzolamide in 32 pediatric patients less than 6 years of age, diagnosed with glaucoma or ocular hypertension. Some patients were naive to IOP therapy whilst others were on other IOP-lowering medicinal product(s). Those who had been on previous IOP medicinal products were not required to discontinue their IOP medicinal product(s) until the initiation of monotherapy with brinzolamide. 11
MATERIALS AND METHODS
Animals
Hairless female C3.Cg/TifBomTac immunocompetent mice (n = 125), aged 14–22 weeks at the beginning of the experiment, purchased from Taconic (Ry, Denmark) were used in this study. Mice were anesthetized with 0.05 mL of HypDorm (0.158 mg/mL fentanyl citrate, 5 mg/mL fluanisone, 2.5 mg/mL midazolam), tattooed with consecutive numbers on the abdomen and randomized into five groups. Each group was housed in an individual cage with access to water and a standard diet (Table 1 ) and maintained at 23–24°C under a 12‐h light‐dark cycle. This study followed recommendations described by national guidelines. All protocols were approved by national (permit number 2014‐15‐0201‐00096) and institutional ethical committees.
TABLE 1
Treatment schedule and median number of days until 50% of the mice had a first, second, and third tumor.
| Group | Treatment | Irradiation dose (SEDs) | Median days to first tumor (Q3–Q1) † | Median days to second tumor (Q3–Q1) † | Median days to third tumor (Q3–Q1) † |
|---|---|---|---|---|---|
| 1 | 1% brimonidine cream before UVR | 3 | 295 (302–288) | 302 (309–302) | 309 (316–302) |
| P‐value ‡ | 0.000006 | 0.000004 | 0.000001 | ||
| 2 | 0.33% brimonidine gel before UVR | 3 | 267 (295–254) | 281 (295–267) | 288 (295–274) |
| P‐value ‡ | 0.313 | 0.447 | 0.372 | ||
| 3 | 1% brimonidine cream after UVR | 3 | 274 (281–261) | 288 (295–274) | 295 (295–288) |
| P‐value ‡ | 0.252 | 0.172 | 0.080 | ||
| 4 | UVR, no drug treatment (UVR control) | 3 | 267 (274–254) | 274 (281–267) | 274 (288–267) |
| 5 | 1% brimonidine cream | NA | No tumor | No tumor | No tumor |
Identification
Brinzolamide is a carbonic anhydrase inhibitor used for the reduction of elevated intraocular pressure in patients with ocular hypertension or open-angle glaucoma.
Brinzolamide is a highly specific, non-competitive, reversible carbonic anhydrase II (CA-II) inhibitor indicated to reduce ocular pressure in patients with ocular hypertension or open-angle glaucoma. 5 Although the exact pathophysiology of glaucoma is still unknown, one of the main hallmarks of this disease is vascular dysregulation and abnormalities. 1,2 The resulting vascular resistance increases intraocular pressure, thus impairing ocular perfusion. 1,2 Although systemic anti-carbonic anhydrase (CA) therapy has been used for almost 50 years with varying degrees of success, systemic administration results in an increase in incidences of adverse effects. 1,2
Brinzolamide was developed as a topical solution to the systemic side effects and dorzolamide, the first-ever approved topical CA inhibitor with contrasting results and evidence. 2 Unlike dorzolamide, brinzolamide has a higher lipophilicity to facilitate diffusion across the blood-retinal barrier. 2 Brinzolamide was approved by the FDA in 1998 as a standalone product and in 2013 as a combination product with brimonidine tartrate. 5,6 In Europe, it was also approved as a combination product with timolol in 2008. 7
Type Small Molecule Groups Approved Structure
Structure for Brinzolamide (DB01194)
Weight Average: 383.507Monoisotopic: 383.064332867 Chemical Formula C12H21N3O5S3 Synonyms Poor quality drug data slowing you down?
Unlock 38% more drug discovery time and eliminate decision-making doubts with this one-stop guide to quality drug data.
INTRODUCTION
Brimonidine is a selective α2A‐adrenergic agonist (1) that is synthesized from a quinoxaline base (2) and exhibits diverse biological activities, such as neuroprotection (3), vasoconstriction (4) and anti‐inflammatory effects (4, 5). It is routinely used to lower intraocular pressure and has also been used to treat facial erythema in patients with rosacea (6) by reversing the vasodilation of superficial blood vessels in the skin (1, 7, 8, 9). Facial flushing, erythema and a burning sensation have all been described as adverse effects of the drug by patients with rosacea (1, 8, 9, 10).
Nizari et al. (3) confirmed the neuroprotective effect of brimonidine in different glaucoma‐related models and demonstrated that this effect is mediated by a soluble amyloid precursor protein. Piwnica et al. (4) used in vitro vascular and ex vivo human skin biopsy neuroinflammation models to show that brimonidine stimulated vasoconstriction of human subcutaneous arteries and vessels with diameters of
Associated Data
The data presented in this study are available in article and Supplementary Materials.
Brimonidine, a selective alpha-2 adrenergic agonist used for the treatment of open-angle glaucoma, has been shown to cause neurological side effects such as unresponsiveness, lethargy, hypoventilation, and stupor, mimicking opioid toxicity. We report one case of transient encephalopathy in a toddler, in whom accidental brimonidine toxicity was suspected and then confirmed by a toxicology study. The healthy 8-month-old girl was taken to the pediatric ER since she was drowsy and hypotonic with miosis. The computed tomography scan of her brain and toxicological workup of her blood and urine were negative. Starting from the fourth hour, the child progressively improved, and by the sixth hour, she recovered to a normal state of consciousness. A survey of available drugs within the child’s reach showed the presence of brimonidine. Thus, ultra-performance liquid chromatography–tandem mass spectrometry (UPLC-MS/MS) was applied to quantify the brimonidine in urine and plasma samples, showing levels of 8.40 ng/mL and 0.79 ng/mL, respectively. To our knowledge, this is the first report to determine brimonidine levels in urine and plasma using UPLC-MS/MS. Insufficient knowledge on the part of family members about the potential hazards of an apparently innocuous, topical medication such as eye drops may put children at a greater risk of poisoning. Necessary warnings should be given to parents with greater care when prescribing this medication.
Keywords: brimonidine, eye drop poisoning, tandem mass spectrometry