mAChR3/muscarinic acetylcholine receptor

The morphology and viability of human corneal stromal (HCS) cells were assessed using light microscopy and the MTT assay, respectively, in order to assess the cytotoxicity of pilocarpine. HCS cells exposed to pilocarpine at concentrations ranging from 0.625 to 20 g/L exhibited morphological abnormalities, including cell shrinkage, cytoplasmic vacuolization, detachment from the culture matrix, and eventual death, as well as dose- and time-dependent proliferation retardation. At concentrations lower than 0.625 g/L, however, no discernible difference was found between the pilocarpine exposure group and the control group. The MTT assay results demonstrated that HCS cell viability decreased with increasing time and concentration following treatment with pilocarpine at a concentration greater than 0.625 g/L (P<0.01 or 0.05), whereas cell viability of HCS cells treated with pilocarpine at a concentration lower than 0.625 decreased with increasing time and concentration (P<0.01 or 0.05). g/L did not change appreciably from the control [2]. In isolated segments of rat tail arteries constricted with norepinephrine (10 to 200 nM), the partial muscarinic agonist pilocarpine elicits concentration-dependent relaxation with an EC50 of 2.4 mM [3].

The effects of pilocarpine on salivation were investigated in exercised (EX) and control (CN) rats. Saliva volume caused by pilocarpine was considerably higher in EX rats compared to CN rats (P<0.01). Conversely, EX rats' saliva had a considerably lower Na+ content than CN rats' (P<0.05)[1].

After HCS cells were treated with pilocarpine at a concentration from 0.15625 g/L to 20.0 g/L, their morphology and viability were detected by light microscopy and MTT assay. The membrane permeability, DNA fragmentation and ultrastructure were examined by acridine orange (AO)/ethidium bromide (EB) double-staining. DNA electrophoresis and transmission electron microscopy (TEM), cell cycle, phosphatidylserine (PS) orientation and mitochondrial transmembrane potential (MTP) were assayed by flow cytometry (FCM). And the activation of caspases was checked by ELISA[3].

0.5 mg/kg; i.p. Rats: Male, 10-week-old Wistar rats are assigned to one of two groups, exercise (EX, n=6) and control (CN, n=6). The EX rats are kept for 40 days in cages with a running wheel (SN-451), allowing them to undertake voluntary exercise, while the CN rats are kept in cages with the running wheel locked. On the 40th day, Pilocarpine-induced saliva is measured as follows. Briefly, the rats are anesthetized, preweighed cotton was placed in their mouths sublingually, and Pilocarpine (0.5 mg/kg) is intraperitoneally injected to induce saliva secretion. Each cotton ball is then changed every 10 min for 1 h. The collected cotton balls are weighed again, and the mass of saliva secreted is calculated by subtracting the initial from the final weight.

Absorption, Distribution and Excretion
Following oral administration of pilocarpine 5mg three times daily in healthy male subjects, peak plasma drug concentrations of 15μg/L were reached in 1.25 hours. At the dose of pilocarpine 10mg three times daily, peak plasma drug concentrations of 41μg/L were reached in 0.85 hours. The rate of absorption is increased when taken with food. Following ophthalmic administration in healthy subjects, the overall median Tmax was 2.2 hours. The mean (SD) Cmax and AUC0-t were 897.2 (287.2) pg/mL and 2699 (741.4) hr x pg/mL, respectively. In patients with presbyopia, the mean Cmax and AUC0-t,ss values were 1.95 ng/mL and 4.14 ng x hr/mL, respectively. The median Tmax was 0.3 hours postdose with a range from 0.2 to 0.5 hours post-dose.
Pilocarpine and its degradation products are eliminated predominantly in the urine.
There is no information available.
There is no information available.
LITTLE DEFINITIVE INFORMATION IS AVAIL ON FATE & ELIMINATION OF PILOCARPINE. IT IS PARTLY DESTROYED IN BODY, BUT LARGER FRACTION IS EXCRETED IN URINE IN COMBINED FORM.
PILOCARPINE PENETRATES EYE WELL; AFTER TOPICAL INSTILLATION...
POISONING HAS OCCURRED FROM CUTANEOUS ABSORPTION.

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Metabolism / Metabolites
There is limited information available about the metabolism of pilocarpine in humans. Inactivation of pilocarpine can occur at neuronal synapses and probably in plasma. Pilocarpine is reported to undergo CYP2A6-mediated 3-hydroxylation to form stereoisomers of 3-hydroxypilocaripine. Pilocaripine also undergoes hydrolysis mediated by paraoxonase 1, a calcium-dependent esterase in plasma and the human liver. Pilocarpic acid is a possible metabolic product of hydrolysis. Pilocarpine metabolites are reported to possess negligible or no pharmacological activity.
Pilocarpine has known human metabolites that include 3-hydroxypilocarpine.
Possibly occurs at the neuronal synapses and in the plasma
Half Life: 0.76 hours

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Biological Half-Life
The elimination half-life was 0.76 and 1.35 hours following administration of a 5mg or lOmg dose 3 times daily, respectively. Following ophthalmic administration in healthy subjects, the half-life was 3.96 hours.

Toxicity Summary
Pilocarpine is a cholinergic parasympathomimetic agent. It increase secretion by the exocrine glands, and produces contraction of the iris sphincter muscle and ciliary muscle (when given topically to the eyes) by mainly stimulating muscarinic receptors.

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Hepatotoxicity
In clinical trials of pilocarpine, serum enzyme elevations were uncommon and no more frequent than with placebo. Despite, wide scale use, there have been no published reports of acute liver injury attributable to pilocarpine.

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Effects During Pregnancy and Lactation
◉ Summary of Use during Lactation
Limited information indicates that maternal use of ophthalmic pilocarpine did not adversely affect the breastfed infant. If ophthalmic pilocarpine is used during breastfeeding, monitor the infant for signs of cholinergic excess (diarrhea, lacrimation, and excessive salivation or urination), especially in younger, exclusively breastfed infants. To substantially diminish the amount of drug that reaches the breastmilk after using eye drops, place pressure over the tear duct by the corner of the eye for 1 minute or more, then remove the excess solution with an absorbent tissue.
Because no information is available on the use of oral pilocarpine during breastfeeding, an alternate drug may be preferred, especially while nursing a newborn or preterm infant.
◉ Effects in Breastfed Infants
A woman with glaucoma used a pilocarpine insert (Ocusert; strength not specified) in one eye while nursing (extent not stated) her newborn infant for 9 weeks. No adverse reactions were noted in the infant.[1]
A mother who was taking pilocarpine eye drops (concentration not stated) twice daily as well as 2 drops of timolol 0.5% eye drops daily and acetazolamide 250 mg orally twice daily and delivered a preterm infant at 36 weeks of gestation. The infant began 5 months of exclusive breastfeeding at 6 hours after birth. On day 2, the infant developed electrolyte abnormalities consisting of hypocalcemia, hypomagnesemia, and metabolic acidosis. The infant was treated with oral calcium gluconate and a single dose of intramuscular magnesium sulfate. Despite continued breastfeeding and maternal drug therapy, the infant's mild metabolic acidosis disappeared on day 4 of life and the infant was gaining weight normally at 1, 3 and 8 months, but had mild hypotonicity. The authors considered the metabolic effects to be caused by transplacental passage of acetazolamide that resolved despite the infant being breastfed. The infant gained weight adequately during breastfeeding, but had some mild, residual hypertonicity of the lower limbs requiring physical therapy.[2]
◉ Effects on Lactation and Breastmilk
Relevant published information in nursing mothers was not found as of the revision date. In animals, cholinergic drugs increase oxytocin release,[3] and have variable effects on serum prolactin.[4] Other centrally acting cholinergic drugs increase serum prolactin in humans.[5][6] The prolactin level in a mother with established lactation may not affect her ability to breastfeed.

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Protein Binding
Pilocarpine does not bind to human or rat plasma proteins over a concentration range of 5 to 25,000 ng/mL. The effect of pilocarpine on plasma protein binding of other drugs has not been evaluated.

[1]. Matsuzaki K, et al. Daily voluntary exercise enhances pilocarpine-induced saliva secretion and aquaporin 1 expression in rat submandibular glands. FEBS Open Bio. 2017 Dec 7;8(1):85-93.
[2]. Tonta MA, et al. Pilocarpine-induced relaxation of rat tail artery by a non-cholinergic mechanism and in the absence of an intact endothelium. Br J Pharmacol. 1994 Jun;112(2):525-32.
[3]. Yuan XL, et al. Cytotoxicity of pilocarpine to human corneal stromal cells and its underlying cytotoxic mechanisms. Int J Ophthalmol. 2016 Apr 18;9(4):505-11.
[4]. Wang RF, et al. Post-treatment with the GLP-1 analogue liraglutide alleviate chronic inflammation and mitochondrial stress induced by Status epilepticus. Epilepsy Res. 2018 Mar 9;142:45-52.

Therapeutic Uses
Miotics; Muscarinic Agonists; Parasympathomimetics
PILOCARPINE IS USED IN TREATMENT OF GLAUCOMA... IT CAN ALSO BE GIVEN IN OINTMENT OR AS LAMELLAE. ...MIOTIC ACTION OF PILOCARPINE IS USEFUL IN OVERCOMING MYDRIASIS PRODUCED BY ATROPINE; ALTERNATED WITH MYDRIATICS...EMPLOYED TO BREAK ADHESIONS BETWEEN IRIS & LENS.
PILOCARPINE IS BETTER TOLERATED THAN ANY OTHER MIOTIC. /HCL/
PILOCARPINE IS MIOTIC OF CHOICE FOR INITIAL & MAINTENANCE THERAPY IN PRIMARY OPEN-ANGLE GLAUCOMA & MOST OTHER CHRONIC GLAUCOMAS. ...USED FOR EMERGENCY TREATMENT OF ACUTE ANGLE-CLOSURE GLAUCOMA.
For more Therapeutic Uses (Complete) data for PILOCARPINE (6 total), please visit the HSDB record page.

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Drug Warnings
/PILOCARPINE/...SHOULD NOT BE USED FOR LONG PERIODS IN SUCH CASES TO AVOID OR POSTPONE IRIDECTOMY BECAUSE ANY MIOTIC MAY TIGHTEN PUPIL AGAINST LENS & BLOCK FLOW OF AQUEOUS THROUGH PUPIL.

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Pharmacodynamics
Pilocarpine is a muscarinic agent that mediates diaphoretic, miotic, and central nervous system effects. Pilocarpine stimulates the secretion of various exocrine glands, such as sweat, lacrimal, salivary, and gastrointestinal glands. Following oral administration, pilocarpine increased the mean salivary flow rate by 2- to lO-folds than placebo. Its peak levels were maintained for at least one to two hours. Pilocarpine increases smooth muscle tone, contracts the pupillary and iris sphincter muscles, and induces miosis. Because pilocarpine may affect all five muscarinic receptor subtypes, it is associated with parasympathetic side effects.

C11H16N23O2

208.2569

208.121

C, 63.44; H, 7.74; N, 13.45; O, 15.36

92-13-7

Pilocarpine Hydrochloride;54-71-7;Pilocarpine nitrate;148-72-1

5910

OIL OR CRYSTALS
NEEDLES

1.2±0.1 g/cm3

431.8±18.0 °C at 760 mmHg

34℃

215.0±21.2 °C

0.0±1.0 mmHg at 25°C

1.585

-0.09

0

3

3

15

245

2

C(C1=CN=CN1C)[C@H]1COC(=O)[C@H]1CC

QCHFTSOMWOSFHM-WPRPVWTQSA-N

InChI=1S/C11H16N2O2/c1-3-10-8(6-15-11(10)14)4-9-5-12-7-13(9)2/h5,7-8,10H,3-4,6H2,1-2H3/t8-,10-/m0/s1

2(3H)-Furanone, 3-ethyldihydro-4-((1-methyl-1H-imidazol-5-yl)methyl)-, (3S,4R)-

AI3-50523 AI3 50523 AI350523

2934.99.9001

Powder      -20°C    3 years

                     4°C     2 years

In solvent   -80°C    6 months

                  -20°C    1 month

Note: This product requires protection from light (avoid light exposure) during transportation and storage.

Room temperature (This product is stable at ambient temperature for a few days during ordinary shipping and time spent in Customs)

DMSO : ~100 mg/mL (~480.17 mM)

Solubility in Formulation 1: ≥ 2.5 mg/mL (12.00 mM) (saturation unknown) in 10% DMSO + 40% PEG300 + 5% Tween80 + 45% Saline (add these co-solvents sequentially from left to right, and one by one), clear solution.
For example, if 1 mL of working solution is to be prepared, you can add 100 μL of 25.0 mg/mL clear DMSO stock solution to 400 μL PEG300 and mix evenly; then add 50 μL Tween-80 to the above solution and mix evenly; then add 450 μL normal saline to adjust the volume to 1 mL.
Preparation of saline: Dissolve 0.9 g of sodium chloride in 100 mL ddH₂ O to obtain a clear solution.

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Solubility in Formulation 2: ≥ 2.5 mg/mL (12.00 mM) (saturation unknown) in 10% DMSO + 90% (20% SBE-β-CD in Saline) (add these co-solvents sequentially from left to right, and one by one), clear solution.
For example, if 1 mL of working solution is to be prepared, you can add 100 μL of 25.0 mg/mL clear DMSO stock solution to 900 μL of 20% SBE-β-CD physiological saline solution and mix evenly.
Preparation of 20% SBE-β-CD in Saline (4°C，1 week): Dissolve 2 g SBE-β-CD in 10 mL saline to obtain a clear solution.

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Solubility in Formulation 3: ≥ 2.5 mg/mL (12.00 mM) (saturation unknown) in 10% DMSO + 90% Corn Oil (add these co-solvents sequentially from left to right, and one by one), clear solution.
For example, if 1 mL of working solution is to be prepared, you can add 100 μL of 25.0 mg/mL clear DMSO stock solution to 900 μL of corn oil and mix evenly.

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 (Please use freshly prepared in vivo formulations for optimal results.)