Classifications

• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
  • A61K31/00—Medicinal preparations containing organic active ingredients
  • A61K31/21—Esters, e.g. nitroglycerine, selenocyanates
  • A61K31/215—Esters, e.g. nitroglycerine, selenocyanates of carboxylic acids
  • A61K31/235—Esters, e.g. nitroglycerine, selenocyanates of carboxylic acids having an aromatic ring attached to a carboxyl group
  • A61K31/24—Esters, e.g. nitroglycerine, selenocyanates of carboxylic acids having an aromatic ring attached to a carboxyl group having an amino or nitro group
  • A61K31/245—Amino benzoic acid types, e.g. procaine, novocaine
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
  • A61K47/00—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient
  • A61K47/02—Inorganic compounds
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
  • A61K47/00—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient
  • A61K47/06—Organic compounds, e.g. natural or synthetic hydrocarbons, polyolefins, mineral oil, petrolatum or ozokerite
  • A61K47/08—Organic compounds, e.g. natural or synthetic hydrocarbons, polyolefins, mineral oil, petrolatum or ozokerite containing oxygen, e.g. ethers, acetals, ketones, quinones, aldehydes, peroxides
  • A61K47/12—Carboxylic acids; Salts or anhydrides thereof
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
  • A61K47/00—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient
  • A61K47/30—Macromolecular organic or inorganic compounds, e.g. inorganic polyphosphates
  • A61K47/36—Polysaccharides; Derivatives thereof, e.g. gums, starch, alginate, dextrin, hyaluronic acid, chitosan, inulin, agar or pectin
  • A61K47/38—Cellulose; Derivatives thereof
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
  • A61K9/00—Medicinal preparations characterised by special physical form
  • A61K9/0012—Galenical forms characterised by the site of application
  • A61K9/0048—Eye, e.g. artificial tears
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
  • A61K9/00—Medicinal preparations characterised by special physical form
  • A61K9/06—Ointments; Bases therefor; Other semi-solid forms, e.g. creams, sticks, gels
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
  • A61P23/00—Anaesthetics
  • A61P23/02—Local anaesthetics

Definitions

• the present invention relates to topical dosage forms and formulations of chloroprocaine for inducing local anesthesia and analgesia, that are therapeutically effective, chemically stable, and particularly useful for short ophthalmic medical procedures
• Topical anesthetics are marketed without prescription for the relief of various conditions including sunburn, minor burns, insect bites and stings, poison ivy, poison oak, poison sumac, and minor cuts and abrasions. They are also used during minor surgical procedures. Dentists use them to numb oral tissue before injecting a local anesthetic; ophthalmologists use them to numb the surface of the eye when performing minor surgeries and medical procedures; and otolaryngologists use them when performing procedures in the ear canal. Molecules approved as topical anesthetics in the United States and Europe include lidocaine, benzocaine, prilocaine, and oxybuprocaine, among others.
• Chloroprocaine HCl is a short acting spinal anesthetic that is available in Europe and the United States in injectable dosage forms. It it approved in Europe for surgical procedures up to 40 minutes, and in the United States for intrathecal use and for the production of local anesthesia by infiltration and peripheral nerve block.
• An intrathecal injectable formulation is reported in U.S. Patent No. 8,969,412 to Sintetica S.A. This formulation comprises chloroprocaine HCl, sodium chloride, and enough hydrochloric acid to impart a pH of from 3 to 4.
• the patent also reports that it is important when manufacturing chloroprocaine dosage forms to work in an oxygen free environment purged with nitrogen, to prevent degradation of the chloroprocaine.
• chloroprocaine Other injectable formulations of chloroprocaine are reported in the FDA-approved prescribing information for Nesacaine ® . These formulations contain chloroprocaine HCl (1-3%), sodium chloride, and optionally disodium EDTA dehydrate and methylparaben. The molecule has never been approved in a topical formulation, presumably because it is highly hydrophilic and does not pass through the skin.
• Chloroprocaine HC1 has never been manufactured in a topical dosage form and could be attractive, particularly if the stability and manufacturing issues with the molecule could be overcome.
• the invention provides a topical formulation for inducing local analgesia or anesthesia comprising: (a) a therapeutically effective amount of chloroprocaine or a pharmaceutically acceptable salt thereof for inducing said local analgesia or anesthesia; (b) one or more thickening agents; and (c) water.
• a particularly suitable thickening agent is hydroxyethyl cellulose which, it has been discovered, exerts a stabilizing influence on the chloroprocaine.
• chloroprocaine must normally be handled in an oxygen-free environment purged with an inert gas such as nitrogen to prevent degradation of the chloroprocaine, the inventors have discovered that chloroprocaine formulated with hydroxyethyl cellulose does not require purging with an inert gas.
• the invention provides a method of inducing local analgesia or anesthesia in a mammalian subject in need thereof comprising topically administering to said mammal a formulation of the present invention.
• a pharmaceutical excipient refers to one or more pharmaceutical excipients for use in the presently disclosed formulations and methods.
• the term “about” will compensate for variability allowed for in the pharmaceutical industry and inherent in pharmaceutical products, such as differences in product strength due to manufacturing variation and time-induced product degradation. In one embodiment the term allows for any variation which in the practice of pharmaceuticals would allow the product being evaluated to be considered pharmaceutically equivalent or bioequivalent to the recited strength. In another embodiment the term allows for any variation within 5% of the recited strength or concentration of the formulation.
• the terms “treating” and “treatment,” when used herein, refer to the medical management of a patient with the intent to cure, ameliorate, stabilize, or prevent a disease, pathological condition, injury, or disorder (collectively "disorder").
• This term includes active treatment, that is, treatment directed specifically toward the improvement of a disorder, and also includes causal treatment, that is, treatment directed toward removal of the cause of the associated disorder.
• this term includes palliative treatment, that is, treatment designed for the relief of symptoms rather than the curing of the disorder; preventative treatment, that is, treatment directed to minimizing or partially or completely inhibiting the development of the disorder; and supportive treatment, that is, treatment employed to supplement another specific therapy directed toward the improvement of the disorder.
• therapeutically effective amount refers to an amount sufficient to elicit the desired biological response.
• the therapeutically effective amount or dose will depend on the age, sex and weight of the patient, and the current medical condition of the patient. The skilled artisan will be able to determine appropriate dosages depending on these and other factors in addition to the present disclosure.
• “Pharmaceutically acceptable” means that which is useful in preparing a pharmaceutical composition that is generally safe, non-toxic and neither biologically nor otherwise undesirable and includes that which is acceptable for veterinary use as well as human pharmaceutical use.
• “Pharmaceutically acceptable salts” means salts that are pharmaceutically acceptable, as defined above, and which possess the desired pharmacological activity.
• weight can refer to the weight of the free base or the weight or the entire salt.
• the weight can be refer to the weight of the hydrate or the weight of the molecule without the waters of hydration.
• ranges are expressed herein by specifying alternative upper and lower limits of the range, it will be understood that the endpoints can be combined in any manner that is mathematically feasible.
• a range of from 50 or 80 to 100 or 70 can alternatively be expressed as a series of ranges of from 50 to 100, from 50 to 70, and from 80 to 100.
• a series of upper bounds and lower bounds are related using the phase and/or, it will be understood that the upper bounds can be unlimited by the lower bonds or combined with the lower bounds, and vice versa.
• a range of greater than 40% and/or less than 80% includes ranges of greater than 40%, less than 80%, and greater than 40% but less than 80%.
• the invention can be defined based on several principal embodiments which can be combined in any manner physically and mathematically possible to create additional principal embodiments.
• the invention provides a topical formulation for inducing local analgesia or anesthesia comprising: (a) a therapeutically effective amount of chloroprocaine or a pharmaceutically acceptable salt thereof for inducing said local analgesia or anesthesia; (b) one or more thickening agents, preferably hydroxyethyl cellulose; and (c) water.
• the invention provides a topical gel for inducing local analgesia or anesthesia comprising: (a) a therapeutically effective amount of chloroprocaine or a pharmaceutically acceptable salt thereof for inducing said local analgesia or anesthesia; (b) one or more thickening agents, preferably hydroxyethyl cellulose; and (c) water.
• the invention provides an ophthalmic topical gel for inducing local analgesia or anesthesia comprising: (a) a therapeutically effective amount of chloroprocaine or a pharmaceutically acceptable salt thereof for inducing said local analgesia or anesthesia; (b) one or more thickening agents, preferably hydroxyethyl cellulose; and (c) water.
• the invention provides a method of manufacturing the formulation of the present invention comprising admixing chloroprocaine or a pharmaceutically acceptable salt thereof, one or more thickening agents, a pH adjuster, and water to make a formulation.
• the invention provides a method of inducing local analgesia or anesthesia in a mammalian subject in need thereof comprising topically administering to said mammal a formulation of the present invention.
• the invention can further be understood with reference to various subembodiments which can modify any of the principal embodiments. These subembodiments can be combined in any manner that is both mathematically and physically possible to create additional subembodiments, which in turn can modify any of the principal embodiments.
• Suitable dosage forms for the formulations of this invention include gels, lotions, ointments, pastes and creams.
• the weight concentration of the chloroprocaine in the formulation will typically range from 1% to 5%, or from 2% to 4%, but most often will be approximately 3%.
• the chloroprocaine will typically be present as a salt, and this concentration will typically be based on the weight of the entire salt, although these percentages could also be used based on the weight of the free base.
• a particularly preferred salt for the formulations of the present invention is the hydrochloride salt.
• the thickening agent is also an important component of the formulation for ensuring the stability of the formulation and its utility in medical applications, particularly ophthalmic applications.
• the thickening agent preferably yields a clear formulation, yet is easily processed to produce a product with appropriate viscosity and handling characteristics.
• Suitable thickening agents include, for example, cellulose derivatives, natural gums, and inorganic compounds. More particular examples include methyl cellulose, hydroxyethyl cellulose, hydroxypropyl cellulose, xanthan gum, guar gum, pectin, aluminum silicate, magnesium aluminum silicate, silica, and combinations thereof.
• Hydroxyethyl cellulose has proven especially useful in the formulations of the present invention, at weight concentrations ranging from 0.1% to 2.5%.
• a preferred weight concentration of hydroxyethyl cellulose ranges from 0.25% to 2.0% by weight hydroxyethyl cellulose, or from 0.75% to 1.75%, with 1.0%, or 1.5% most preferred.
• the formulations also benefit from the addition of a pH adjusting agent to prevent hydrolysis of the chloroprocaine.
• the pH of the formulations will preferably be reduced to a pH of from 1 to 6, from 2 to 5, or from 3 to 4 by the pH adjusting agent.
• Suitable pH adjusting agents for use in the formulations include hydrochloric acid, lactic acid, citric acid and tartaric acid, with hydrochloric acid most preferred.
• hydrochloric acid equivalent to from 0.05% to 0.35% or from 0.10% to 0.25% IN hydrochloric acid is typically added to the formulations, preferably from 0.13% to 0.17% IN hydrochloric
• the formulations are aqueous-based formulations.
• the water used in the formulations is preferably purified and degassed through nitrogen bubbling or other suitable technique.
• the concentration of chloroprocaine HC1 in the formulation can be 2-4 wt%, 2.5-3.5 wt%, or about 3.0 wt%;
• the viscosity of the formulation can be 300-1500 mPas, 600-1400 mPas.
• hydroxyethyl cellulose can be added in an amount (q.s.) needed to achieve any of the foregoing viscosities;
• the concentration of hydroxyethyl cellulose in the formulation can be 0.25- 2.0 wt%, 0.5-1.5 wt%, 0.6-1.4 wt%, 0.5-1.0 wt%, 0.6-0.9 wt %, 0.7-0.8 wt%, 0.8-1.2 wt%, or 0.9-1.1 wt%; and/or
• the pH of the formulation can be 2.5-4.5 pH, 2.8-3.8 pH, or 3.0-3.4 pH.
• HC1 can be added in an amount (q.s.) needed to achieve any of the foregoing pH levels.
• the formulation of the present invention comprises from 2% to 4% by weight chloroprocaine HC1; from 0.25 to 2.0% hydroxyethyl cellulose; hydrochloric acid q.s. to pH from 2.8 to 4.0 and purified water q.s. to 100%.
• the formulation of the present invention comprises from 2% to 4% by weight chloroprocaine HC1; from 0.6 to 0.9% hydroxyethyl cellulose; hydrochloric acid q.s. to pH from 2.8-4.0; and purified water q.s. to 100%.
• the formulation of the present invention comprises from 2% to 4% by weight chloroprocaine HCl; from 0.8 to 1.2% hydroxy ethyl cellulose; hydrochloric acid q.s. to pH from 2.8-4.0; and purified water q.s. to 100%.
• the formulation of the present invention comprises from 2% to 4% by weight chloroprocaine HCl; hydroxy ethyl cellulose q.s. to 600-1400 mPas; hydrochloric acid q.s. to pH from 2.8 to 4.0; and purified water q.s. to 100%.
• the formulation of the present invention comprises from 2% to 4% by weight chloroprocaine HCl; hydroxy ethyl cellulose q.s. to 500-900 mPas; hydrochloric acid q.s. to pH from 2.8 to 4.0 ; and purified water q.s. to 100%.
• the formulation of the present invention comprises from 2% to 4% by weight chloroprocaine HCl; hydroxy ethyl cellulose q.s. to 600-800 mPas; hydrochloric acid q.s. to pH from 3.0 to 4.0; and purified water q.s. to 100%.
• the formulation of the present invention comprises from 2% to 4% by weight chloroprocaine HCl; hydroxy ethyl cellulose q.s. to 900-1500 mPas; hydrochloric acid q.s. to pH from 2.8 to 4.0; and purified water q.s. to 100%.
• the formulation of the present invention comprises from 2% to 4% by weight chloroprocaine HCl; hydroxy ethyl cellulose q.s. to 1100-1400 mPas; hydrochloric acid q.s. to pH from 3.0 to 4.0; and purified water q.s. to 100%.
• the formulation of the present invention comprises 3% by weight chloroprocaine HCl; from 0.25 to 2.0% hydroxy ethyl cellulose; hydrochloric acid in a volume equivalent to 0.17% to 0.13% IN hydrochloric acid; and purified water q.s. to 100%.
• the formulations can also be characterized by other features.
• the formulation is preferably sterile.
• the formulation preferably has a viscosity of from 100 to 12000 mPas or from 1000 to 10000 mPas, or from 4000 to 9000 mPas, as measured by a BrookField DV Il+Pro 2 or 3 speed Spindle at 100 rpm, as described in section 2.2.10 of the European Pharmacopeia 2016 edition.
• the formulation also is preferably either clear or translucent.
• the formulations of the present invention can be used in any method that topical anesthetics have historically been used, although they have particular utility in ophthalmic applications.
• the formulations have been found effective for inducing local anesthesia or analgesia on the corneal surface, and can be used during ocular surgery or in response to a corneal abrasion or trauma.
• Particularly suitable surgeries for practicing the present invention include, for example, cataract surgery, treatment for maculopathy, conventional glaucoma surgery, vitrectomy, surgeries for diabetic nephropathy, and various laser surgeries including laser-assisted in situ keratomileusis and photorefractive keratectomy.
• the formulations induce local analgesia or anesthesia in the eye, and they do so without inducing significant irritation.
• formulations of the present invention can be manufactured using conventional manufacturing techniques as described, for example, in REMINGTON: THE SCIENCE AND PRACTICE OF PHARMACY (22d edition), although several discoveries have been made to improve their manufacture.
• the formulations can be handled in the presence of air, without nitrogen purge.
• the finished formulation can be filled into suitable containers such as sachets, tubes, jars and vials, in the presence of air.
• a preferred packaging format is a monodose presentation that contains approximately 0.5 to 2 grams of gel.
• the drug can be packaged in a small envelope of opposing sheets sealed around their periphery that is torn at one end before use, and the gel squeezed from the container.
• a preferred package is a low density polyethylene monodose vial such as the 1840 H LDPE from LyondellBasell Industries N.V., Rotterdam Netherlands.
• the inventors have developed a sterilization process for the drug solution, prior to mixing with the gel excipients. This is achieved using filtration sterilization for the drug solution through a hydrophilic cartridge having a pore width of from 0.22 to 0.45 microns.
• the process of admixing all of the formulation ingredients is divided into several discreet steps comprising (a) admixing said one or more thickening agents, said pH adjuster, and water to make a placebo matrix, (b) thermally sterilizing the placebo matrix, (c) admixing chloroprocaine or a pharmaceutically acceptable salt thereof with water and optionally a pH adjuster to prepare a drug solution, (d) sterilizing said drug solution by filtering said drug solution through a filter having a pore width of from 0.22 to 0.45 microns, and (e) mixing the placebo matrix and the drug solution to make said formulation.
• the chloroprocaine can be dissolved in water at about 40 °C to a concentration of 0.06-0.1 g/mL to ensure the chloroprocaine is fully solubilized without precipitation.
• the chloroprocaine / water solution can be acidified with HC1 at about 40 °C soi that the stability or solubility of the chloroprocaine is unaffected; thus not affecting neither API degradation nor its solubility.
• the placebo matrix can be allowed to cool prior to the addition of the drug solution.
• the chloroprocaine / water solution can be transferred via sterilizing filtration towards the hydroxyethyl cellulose solution / placebo matrix.
• hydroxyethyl cellulose is the preferred thickening agent, in an amount which imparts the desired viscosity
• hydrochloric acid (IN) is the preferred pH adjusting agent
• the process preferably comprises admixing 3% by weight chloroprocaine HC1, 0.25 to 2.0% hydroxyethyl cellulose, hydrochloric acid q.s. to pH 3.0-4.0 (or in a volume equivalent to 0.17% to 0.13% IN hydrochloric acid) and purified water q.s. to 100% to make the formulation.
• a similar formulation could be prepared, using an even higher concentration of hydroxy ethyl cellulose (such as 1.5%), using substantially the same proportions of excipients as formulations 1 and 2, and the methods described herein.
• Viscosity of the formulations described in Table 2B was measured by a BrookField DV II+Pro 2 or 3 speed Spindle at 100 rpm, as described in section 2.2.10 of the European Pharmacopeia 2016 edition. Results of viscosity measurements are reported in Table 3 c.
• a 2-speed spindle was employed for the 90 mPas formula 1 ; a 3 -speed spindle was employed for the 400 mPas formula 2.
• Stage 1 determined the smallest stimulus (i.e. threshold length of nylon thread) necessary to induce a blinking reflex in the animals after instillation of each of the treatments. Several lengths of nylon were tested to determine the shortest length. This stage gave an idea of the intensity of anesthetic power of each compound at 5 and 15 minutes, and identified a single thread length (2.1 cm) for use in the next stage.
• Stage 2 evaluated the duration of anesthesia using the selected threshold. All treatments were evaluated except animals treated with test item 3, due to intolerance observed with the 5% dose. The duration of anesthesia for each group was tested with the same length of nylon thread determined in stage 1 , so that the mechanical stimulus intensity was the same for all groups. This stage evaluated the start of effect and duration of effect at a given level of mechanical stimulus.
• Formulations 1 and 2 were well tolerated in spite of their low pH.
• formulations 1 and 2 were the most efficient test items (comparable to positive control) in terms of depth of anesthesia followed by formulation 4.
• an anesthesia effect was observed, from 5 minutes after the instillation, until 45 minutes for formulation 1, 60 minutes for formulation 2, 20 minutes for formulation 4, and 90 minutes for Cebesine ® .
• No anesthetic effect was observed for the negative control. Based on these tests, an even more viscous formulation with a longer duration of action, using for example 1.5% or 2% hydroxyethyl cellulose, could also be used.

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