Glycopyrrolate Injection, USP is a synthetic anticholinergic agent. It is intended for intramuscular or intravenous administration. Each 1 mL contains:

Glycopyrrolate, USP 0.2 mg, Water for Injection, USP q.s., pH adjusted, when necessary, with hydrochloric acid and/or sodium hydroxide. Solution does not contain preservatives.

Glycopyrrolate is a quaternary ammonium salt with the following chemical name: 3[(cyclopentylhydroxyphenylacetyl)oxy]-1,1-dimethyl pyrrolidinium bromide.

Glycopyrrolate occurs as a white, odorless crystalline powder. It is soluble in water and alcohol, and practically insoluble in chloroform and ether. It completely ionized at physiological pH values. Glycopyrrolate Injection, USP, is a clear, colorless, sterile liquid; pH 2.0 to 3.0. The partition coefficient of glycopyrrolate in a n-octanol/water system is 0.304 (log10 P= -1.52) at ambient room temperature (24°C).


Glycopyrrolate Injection, USP (0.2 mg/mL) is an anticholinergic indicated for use in:

Anesthesia (all ages)

  • for reduction of salivary, tracheobronchial, and pharyngeal secretions, reduction of volume and acidity of gastric secretions, and blockade of cardiac inhibitory reflexes during induction of anesthesia and intubation,
  • intraoperatively to counteract surgically or drug-induced or vagal reflex-associated arrhythmias, and
  • for protection against peripheral muscarinic effects of cholinergic agents such as neostigmine and pyridostigmine given to reverse the neuromuscular blockade due to non-depolarizing agents.

Peptic ulcer (adults)

  • as adjunctive therapy for the treatment of peptic ulcer when rapid anticholinergic effect is desired or when oral medication is not tolerated.

Mechanism of Action

Glycopyrrolate, like other anticholinergic (antimuscarinic) agents, inhibits the action of acetylcholine on structures innervated by postganglionic cholinergic nerves and on smooth muscles that respond to acetylcholine but lack cholinergic innervation. These peripheral cholinergic receptors are present in the autonomic effector cells of smooth muscle, cardiac muscle, the sinoatrial node, the atrioventricular node, exocrine glands and, to a limited degree, in the autonomic ganglia. Thus, it diminishes the volume and free acidity of gastric secretions and controls excessive pharyngeal, tracheal, and bronchial secretions.


General Dosing and Administration Information

  • Parenteral drug products should be inspected visually for particulate matter and discoloration prior to administration whenever solution and container permit.
  •  Glycopyrrolate Injection may be administered intramuscularly, or intravenously, without dilution.
  • Do not introduce any other fluid into the syringe at any time.
  • Do not dilute for IV push.
  • Do not re-sterilize the syringe.
  • Do not use this product on a sterile field.
  • This product is for single dose only.

Dosing in Adults

Preanesthetic Medication: The recommended dose of Glycopyrrolate Injection is 0.004 mg/kg by intramuscular injection, given 30 to 60 minutes prior to the anticipated time of induction of anesthesia or at the time the preanesthetic narcotic and/or sedative are administered.

Intraoperative Medication: Glycopyrrolate Injection may be used during surgery to counteract drug-induced or vagal reflexes and their associatedarrhythmias (e.g., bradycardia). It should be administered intravenously as single doses of 0.1 mg and repeated, as needed,at intervals of 2 to 3 minutes. Attempt to determine the etiology of the arrhythmia, and perform the surgical or anestheticmanipulations necessary to correct parasympathetic imbalance.


Reversal of Neuromuscular Blockade: The recommended dose of Glycopyrrolate Injection is 0.2 mg for each 1 mg of neostigmine or 5 mg of pyridostigmine.

Peptic Ulcer:  The usual recommended dose of Glycopyrrolate Injection is 0.1 mg administered at 4-hour intervals, 3 or 4 times daily intravenously or intramuscularly. Where more profound effect is required, 0.2 mg may be given. Some patients may need only a single dose. Frequency of administration should be dictated by patient response up to a maximum of four times daily.

Dosing in Pediatric Patients

Preanesthetic Medication: The recommended dose of Glycopyrrolate Injection in pediatric patients is 0.004 mg/kg intramuscularly, given 30 to 60 minutes prior to the anticipated time of induction of anesthesia or at the time the preanesthetic narcotic and/or sedative are administered. Patients under 2 years of age may require up to 0.009 mg/kg.

Do not use this prefilled syringe to administer a dose of less than 0.1 mg (0.5 mL).

Intraoperative Medication: Because of the long duration of action of Glycopyrrolate Injection if used as preanesthetic medication, additional Glycopyrrolate Injection for anticholinergic effect intraoperatively is rarely needed; in the event it is required the recommended pediatric dose is 0.004 mg/kg intravenously, not to exceed 0.1 mg in a single dose which may be repeated, as needed, at intervals of 2 to 3 minutes. Attempt to determine the etiology of the arrhythmia, and perform the surgical or anesthetic manipulations necessary to correct parasympathetic imbalance.

Do not use this prefilled syringe to administer a dose of less than 0.1 mg (0.5 mL).

Reversal of Neuromuscular Blockade: The recommended pediatric dose of Glycopyrrolate Injection is 0.2 mg for each 1 mg of neostigmine or 5 mg of pyridostigmine. In order to minimize the appearance of cardiac side effects, the drugs may be administered simultaneously by intravenous injection and may be mixed in the same syringe. Do not use this prefilled syringe to administer a dose of less than 0.1 mg (0.5 mL).

Peptic Ulcer: Glycopyrrolate Injection is not indicated for the treatment of peptic ulcer in pediatric patients.

Preparation and Handling

Diluent Compatibilities: Dextrose 5% and 10% in water, or saline, dextrose 5% in sodium chloride 0.45%, sodium chloride 0.9%, and Ringer’s Injection.

Diluent Incompatibilities: Lactated Ringer’s solution.

Admixture Compatibilities

Physical Compatibility: This list does not constitute an endorsement of the clinical utility or safety of co-administration of Glycopyrrolate Injection with these drugs. Glycopyrrolate Injection is compatible for mixing and injection with the following injectable dosage forms: atropine sulfate, USP; physostigmine salicylate; diphenhydramine HCl; codeine phosphate, USP; benz-quinamide HCl; hydromorphone HCl, USP; droperidol; levorphanol tartrate; lidocaine, USP; meperidine HCl, USP; pyridostigmine bromide; morphine sulfate, USP; nalbuphine HCl; oxymorphone HCl; procaine HCl, USP; promethazine

HCl, USP; neostigmine methylsulfate, USP; scopolamine HBr, USP; butorphanol tartrate; fentanyl citrate; trimethobenzamide HCl; and hydroxyzine HCl. Glycopyrrolate Injection may be administered via the tubing of a running infusion of normal saline.

Admixture Incompatibilities

Physical Incompatibility: Because the stability of glycopyrrolate is questionable above a pH of 6.0 do not combine Glycopyrrolate Injection in the same syringe with methohexital Na; chloramphenicol Na succinate; dimenhydrinate; pentobarbital Na; thiopental Na; secobarbital Na; sodium bicarbonate; diazepam; dexamethasone Na phosphate; or pentazocine lactate. These mixtures will result in a pH higher than 6.0 and may result in gas production or precipitation.


Glycopyrrolate Injection is contraindicated in:

  • patients with known hypersensitivity to Glycopyrrolate Injection or any of its inactive ingredients.
  • peptic ulcer patients with the following concurrent conditions: glaucoma; obstructive uropathy (for example, bladder neck obstruction due to prostatic hypertrophy); obstructive disease of the gastrointestinal tract (as in achalasia, pyloroduodenal stenosis, etc.); paralytic ileus, intestinal atony of the elderly or debilitated patient; unstable cardiovascular status in acute hemorrhage; severe ulcerative colitis; toxic megacolon complicating ulcerative colitis; myasthenia gravis.


Precipitation of Acute Glaucoma: Glycopyrrolate Injection may cause mydriasis and increase intraocular pressure in patients with glaucoma. Advise patients with glaucoma to promptly seek medical care in the event that they experience symptoms of acute angle closure glaucoma (pain and reddening of the eyes, accompanied by dilated pupils).

Drowsiness or Blurred Vision: Glycopyrrolate Injection may cause drowsiness or blurred vision. Warn patients not to participate in activities requiring mental alertness, such as operating a motor vehicle or other machinery, or performing hazardous work, until these issues resolve.

Heat Prostration: In the presence of fever, high environmental temperature, and/or during physical exercise, heat prostration can occur with use of anticholinergic agents including Glycopyrrolate Injection (due to decreased sweating), particularly in children and the elderly. Advise patients to avoid exertion and high environmental temperature after receiving Glycopyrrolate Injection.

Intestinal Obstruction: Diarrhea may be an early symptom of incomplete intestinal obstruction, especially in patients with ileostomy or colostomy. In this instance treatment with Glycopyrrolate Injection is inappropriate and possibly harmful. Avoid use in patients with these conditions.

Tachycardia: Investigate any tachycardia before giving Glycopyrrolate Injection because an increase in the heart rate may occur. Use with caution in patients with coronary artery disease, congestive heart failure, cardiac arrhythmias, hypertension, and/or hyperthyroidism.

Risk of Use in Patients with Renal Impairment: Renal elimination of glycopyrrolate may be severely impaired in patients with renal failure. Dosage adjustments may be necessary in this population.

Autonomic Neuropathy, Hepatic Disease, Ulcerative Colitis, Prostatic Hypertrophy, or Hiatal Hernia: Use Glycopyrrolate Injection with caution in the elderly and in all patients with autonomic neuropathy, hepatic disease, ulcerative colitis, prostatic hypertrophy, or hiatal hernia, because anticholinergic drugs may aggravate these conditions. Consider dose reduction and closely monitor the elderly and patients with autonomic neuropathy, hepatic disease, ulcerative colitis, prostatic hypertrophy, or hiatal hernia.

Delayed Gastric Emptying/Gastric Stasis: The use of anticholinergetic drugs, including Glycopyrrolate Injection, in the treatment of gastric ulcer may produce a delay in gastric emptying due to antral statis. Monitor patients for symptoms such as vomiting, dyspepsia, early satiety, abdominal distention, and increased abdominal pain. Discontinue Glycopyrrolate Injection treatment if these symptoms develop or worsen on treatment.

Light Sensitivity: Patients may experience sensitivity of the eyes to light. Advise patients to protect their eyes from light after receiving Glycopyrrolate Injection.


The concurrent use of Glycopyrrolate Injection with other anticholinergics or medications with anticholinergic activity, such as phenothiazines, antiparkinson drugs, or tricyclic antidepressants, may intensify the antimuscarinic effects and result in an increase in anticholinergic side effects.

Concomitant administration of Glycopyrrolate Injection and potassium chloride in a wax matrix may increase the severity of potassium chloride-induced gastrointestinal lesions as a result of a slower gastrointestinal transit time.


Pregnancy: Limited data are available with glycopyrrolate use during pregnancy have not identified a drug-associated risk of birth defects and miscarriage, however, most of the reported exposures occurred after the first trimester. Most of the available data are based on studies with exposures that occurred at the time of Cesarean-section delivery, and these studies have not identified an adverse effect on maternal outcomes or infant Apgar scores.

Lactation: There are no data on the presence of glycopyrrolate in either human milk or animal milk, the effects on the breastfed infant, or the effects on milk production. As with other anticholinergics, glycopyrrolate may cause suppression of lactation. The developmental and health benefits of breast feeding should be considered along with the mother’s clinical need for Glycopyrrolate Injection and any potential adverse effects on the breastfed child from Glycopyrrolate Injection or from the underlying maternal condition.

Pediatric Use: Safety and effectiveness in pediatric patients have not been established for the management of peptic ulcer. Dysrhythmias associated with the use of glycopyrrolate intravenously as a premedicant or during anesthesia have been observed in pediatric patients.

Infants, patients with Down’s syndrome, and pediatric patients with spastic paralysis or brain damage may experience an increased response to anticholinergics, thus increasing the potential for side effects.

A paradoxical reaction characterized by hyperexcitability may occur in pediatric patients taking large doses of anticholinergics including Glycopyrrolate Injection. Infants and young children are especially susceptible to the toxic effects of anticholinergics.


Geriatric Use: Clinical Studies of Glycopyrrolate Injection did not include sufficient numbers of subjects aged 65 and over to determine whether they respond differently from younger subjects. Other reported clinical experience has not identified differences in responses between the elderly and younger patients. In general, dose selection for an elderly patient should be cautious, usually starting at the low end of the dosing range, reflecting the greater frequency of decreased hepatic, renal, or cardiac function, and of concomitant disease or other therapy.

Renal Impairment: Renal elimination of glycopyrrolate may be severely impaired in patients with renal failure. Dosage adjustments may be necessary.


To combat peripheral anticholinergic effects, a quaternary ammonium anticholinesterase such as neostigmine methylsulfate (which does not cross the blood-brain barrier) may be given intravenously in increments of 0.25 mg in adults. This dosage may be repeated every five to ten minutes until anticholinergic overactivity is reversed or up to a maximum of 2.5 mg. Proportionately smaller doses should be used in pediatric patients. Indication for repetitive doses of neostigmine should be based on close monitoring of the decrease in heart rate and the return of bowel sounds.

If CNS symptoms (e.g., excitement, restlessness, convulsions, psychotic behavior) occur, physostigmine (which does cross the blood–brain barrier) may be used. Physostigmine 0.5 to 2 mg should be slowly administered intravenously and repeated as necessary up to a total of 5 mg in adults. Proportionately smaller doses should be used in pediatric patients.

To combat hypotension, administer IV fluids and/or pressor agents along with supportive care.

Fever should be treated symptomatically.

Following overdosage, a curare-like action may occur, i.e., neuromuscular blockade leading to muscular weakness and possible paralysis. In the event of a curare-like effect on respiratory muscles, artificial respiration should be instituted and maintained until effective respiratory action returns.


Leave a Reply

%d bloggers like this: