Donnamar

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Donnamar

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Medically reviewed

Marina Burgos

Last updated on 22/12/2025

This page provides general, reference-level information compiled from official medical sources. It is not a substitute for professional medical advice, diagnosis, or treatment. For decisions about your health, please consult a qualified healthcare professional.

Overview of Donnamar

Property Description
Active Ingredient Hyoscyamine (as Sulfate salt)
Forms Oral Tablets, Solution, Elixir, Sublingual
Pharmacological Class Anticholinergic, Antispasmodic
General Purpose Relieves smooth muscle spasm and reduces secretions
Origin Natural Plant Alkaloid Derivative

What Type of Medicine is Donnamar?

Donnamar is a prescription pharmaceutical preparation whose active ingredient is hyoscyamine, typically administered as hyoscyamine sulfate, and is fundamentally classified as an anticholinergic agent. Its primary functional classification is that of an antispasmodic, a type of medicine specifically designed to relax involuntary muscle movements. The medication is a single-entity product (monodrug) that is clinically recognized for targeting and modulating the body’s involuntary nervous system.


Is Hyoscyamine a Natural Alkaloid?

Hyoscyamine is a tropane alkaloid derived from natural plant sources, identifying it as a natural plant derivative rather than a fully synthetic compound. This active substance operates by modulating the body's parasympathetic system, which controls functions such as digestion and glandular secretion. Donnamar is supplied in several common dosage forms, including traditional oral tablets, liquid oral solution or elixir, sublingual tablets for rapid absorption, and specialized extended-release tablets for sustained effect.


What is the General Purpose of an Antispasmodic Agent?

The general purpose of this type of antispasmodic agent is to relieve the physical discomfort caused by excessive activity in smooth muscle tissues. The core general benefit of Donnamar is its ability to calm the over-motility of the digestive and urinary tracts, mitigating cramps and spasms. This action also reduces excess secretion of fluids, such as stomach acid and saliva, helping to normalize involuntary processes associated with hyperactivity in these systems. This mechanism makes it suitable for addressing generalized hypermotility.

Regulatory References

  1. National Library of Medicine (NIH)
  2. NIH PubChem

What side effects are possible with Donnamar?

Possible Side Effects and Safety Information

The medicine's safety profile is defined by effects characteristic of its anticholinergic classification, documented in official regulatory sources. These reported adverse reactions involve multiple physiological systems but are not typically assigned a standardized frequency classification (e.g., common, uncommon) in the US FDA Prescribing Information.


System-Organ Classes and Adverse Reactions

The documented effects are grouped by body system, including Gastrointestinal Disorders (dry mouth, constipation, nausea, vomiting), Eye Disorders (blurred vision, mydriasis, increased ocular tension), Cardiac Disorders (tachycardia, palpitations), and Renal/Urinary Disorders (urinary hesitancy and retention). Other effects include headache, drowsiness, weakness, and dizziness.


Serious Adverse Reactions and Safety Constraints

Official regulatory documents highlight serious reported reactions, including Psychosis (confusion, hallucinations, short-term memory loss) and Heat Prostration (fever and heat stroke) due to decreased sweating, especially in high environmental temperatures. Central Nervous System (CNS) signs, when they occur, are officially noted to usually resolve within 12 to 48 hours after discontinuation.

Use of this medicine is restricted (contraindicated) by official labeling in patients with conditions such as glaucoma, obstructive diseases of the urinary or gastrointestinal tract, severe ulcerative colitis, and myasthenia gravis.


Population-Specific Safety Notes

Specific caution is noted for certain populations. Older adults are documented as being more susceptible to anticholinergic effects like constipation and urinary retention, and the potential for severe memory impairment with continued use is noted. Infants and young children are officially documented as being especially susceptible to toxic effects.

Overdose and Emergency Response

Overdose and When to Seek Help

The official regulatory profile for Donnamar (Hyoscyamine) overdose outlines a specific pattern of severe anticholinergic toxicity. Seek emergency medical attention or call the Poison Help line immediately if an overdose is suspected.

Documented Manifestations and Severe Outcomes: Overdose is characterized by a cluster of symptoms documented in prescribing information, including headache, nausea, vomiting, dilated pupils (mydriasis), hot dry skin, dry mouth, difficulty swallowing, and CNS stimulation. Severe presentations may involve central nervous system effects such as confusion, hallucinations, and disorientation. The most life-threatening outcome documented is the progression of a curare-like effect that can lead to paralysis of the respiratory muscles.

Required Emergency Interventions: Regulatory measures specify immediate actions, including immediate lavage of the stomach. For severe anticholinergic effects, the intravenous injection of the antagonist Physostigmine (up to a total of 5 mg) is documented as a necessary therapeutic measure. Fever may be treated symptomatically using tepid sponge baths or a hypothermic blanket. In the event of respiratory muscle paralysis, artificial respiration must be instituted and maintained until effective breathing returns, underscoring the requirement for continuous hospital monitoring.

Therapeutic Uses of Donnamar

What Donnamar Treats: Main Uses and Benefits

Donnamar is generally used as a supportive treatment to provide symptomatic relief in areas where symptoms related to heightened physiological activity cause significant discomfort. Its core purpose is to support the patient during difficult episodes by easing distress, and it contributes to easing the overall symptom load during periods of heightened symptoms.


Managing Acute Gastrointestinal Spasms

This medication is commonly used in situations involving certain distressing symptoms related to the digestive tract. The medication is used to address symptoms associated with disorders of the gastrointestinal (GI) tract, including irritable bowel syndrome, peptic ulcer disease, and diverticulitis. It is applied when groups of symptoms, such as spasms and cramps, appear suddenly or fluctuate, and it contributes to easing the overall symptom load during periods of heightened symptoms.


Other Supportive Symptom Relief

The medication is relevant for easing symptoms linked to organs outside the GI tract. It helps address symptom clusters that may become intense or disruptive, such as the cramping pain of renal (kidney) or biliary colic, and bladder spasms. Additionally, it may assist with managing symptoms related to systemic imbalance, such as excessive salivation (sialorrhea) and heightened respiratory secretions. This supportive relief supports general well-being during symptomatic periods when symptoms become more noticeable.

Quick Fact: Support for Spasms

Regulatory References

  1. NIH MedlinePlus overview

Eligibility and Restrictions for Use

Eligibility and Restrictions

Donnamar (hyoscyamine sulfate) is an anticholinergic medicine whose use is strictly governed by regulatory criteria defining eligible populations and specific exclusions.

Absolute Contraindications

Use is contraindicated in populations that must not receive the medicine due to the risk of exacerbation of their condition. These groups include patients with:

  • Glaucoma (specifically angle-closure risk).
  • Obstructive disease of the gastrointestinal or urinary tract (e.g., paralytic ileus, obstructive uropathy).
  • Myasthenia gravis, severe ulcerative colitis, or toxic megacolon.
  • Unstable cardiovascular status in acute hemorrhage or myocardial ischemia.

Conditional and Age-Based Restrictions

  • Age: The medicine is not recommended for children under 12 years of age in some formulations. Older adults require caution and potentially lower starting doses due to greater susceptibility to anticholinergic effects and possible decreased organ function.
  • Organ Function: Use requires caution in patients with impaired renal function, as the drug is substantially excreted by the kidneys, increasing the risk of toxic reactions.
  • Cardiovascular: Patients with congestive heart failure (CHF) or coronary heart disease (CHD) should use the medicine with caution.
  • Reproductive Status: In pregnancy, the drug is classified as Category C and should be given only if clearly needed. It is excreted in human milk, requiring caution during lactation.

What should I know about interactions with other medicines?

Donnamar Interactions with other medicines and products

Interaction Scope

The official regulatory profile for Donnamar (hyoscyamine sulfate) details documented interactions across several categories of medicinal products. These include agents with Anticholinergic properties, Tricyclic Antidepressants, Monoamine Oxidase (MAO) Inhibitors, and Phenothiazines. Specific interacting substances listed in regulatory documents include Amantadine, Haloperidol, and certain Antihistamines. The mechanistic basis for many documented interactions is cholinergic blockade, which may result in additive adverse effects. The drug's effect of decreased gastrointestinal motility can also alter the absorption of other oral medications, such as Iron (ferrous citrate), which is specifically noted as having reduced absorption.

Timing and Population Notes

A timing-based rule is mandated for Antacids to prevent documented absorption interference: Donnamar must be administered before meals, and Antacids after meals. Population-specific information notes that Geriatric Patients with decreased renal function have an increased potential for toxic reactions to the drug due to its substantial excretion by the kidney. The co-administration of Alcohol or Potassium Supplements is also noted in regulatory information as carrying a risk of increased side effects or potential for localized injury.

Regulatory Context

The interaction information, primarily documented in FDA Prescribing Information, classifies interactions generally as Use-with-Caution/Additive Risk or Absorption-Altering. These constraints define the product’s official interaction profile, strictly based on documented patterns of pharmacodynamic reinforcement and altered pharmacokinetics.

Mechanism of Action

The mechanism of action for Donnamar (Hyoscyamine) involves the modulation of the parasympathetic nervous system via the blockade of a key molecular signal.

Targeted Inhibition of Cholinergic Receptors

This domain focuses on the molecular interaction where the active ingredient, Hyoscyamine, acts as a non-selective competitive antagonist of muscarinic acetylcholine receptors (mAChRs). By occupying these receptor sites, the drug prevents the endogenous neurotransmitter acetylcholine (ACh) from activating target cells, which directly suppresses the primary signaling pathway for involuntary body functions.

Modulation of Involuntary Smooth Muscle Activity

The molecular blockade leads to a suppression of the excitatory signal in smooth muscle tissues, particularly those lining the gastrointestinal and genitourinary tracts. This mechanism modifies the early molecular steps that normally trigger contraction, resulting in a decrease in propulsive motility and the inhibition of involuntary muscle contraction.

Inhibition of Secretomotor Glandular Output

The same receptor antagonism operates on exocrine glands throughout the body, engaging mechanisms that regulate glandular processes. This action inhibits the nerve-driven signal for secretion, resulting in a decrease in the output of exocrine secretions, such as gastric acid, saliva, and bronchial mucus.

Dosage and Administration Information

How to use Donnamar

Donnamar, whose active ingredient is hyoscyamine sulfate, is available in multiple routes and formulations. The medication is used for oral intake as immediate-release (IR) tablets, extended-release (ER) tablets, and oral solutions, while certain forms can also be taken sublingually. Additionally, a solution is utilized for parenteral administration via intravenous, intramuscular, or subcutaneous injection.

Usage frequency depends on the specific formulation. Immediate-release forms are typically taken every four hours as needed (PRN), with single doses ranging from 0.125 mg to 0.25 mg. The maximum total daily intake for adults must not exceed 1.5 mg. In contrast, the 0.375 mg extended-release formulation is administered on a fixed schedule, usually twice daily.

Specific administration constraints govern the proper intake of the drug. IR tablets and liquid solutions are taken 30 to 60 minutes before meals. Critically, extended-release tablets must not be crushed, chewed, or split but swallowed whole to ensure the 0.375 mg dose is released gradually. Dosage requires careful consideration for specific groups; dose selection for older adults is approached cautiously and typically begins at the lower end of the established range. Similarly, pediatric doses for children are reduced, limiting the maximum daily intake of IR forms.

Recent Clinical Evidence

Research evidence / Overview of studies for Donnamar

Evidence for Managing Acute Gastrointestinal Spasms (IBS and Functional Disorders)

Research has included studies on Donnamar, which were applied in research contexts involving fluctuating symptoms, such as Irritable Bowel Syndrome (IBS). These studies, often Randomized Controlled Trials (RCTs) and systematic reviews, evaluated adult populations and examined patient-reported outcomes describing perceived discomfort. Findings across trials described patterns of temporary symptom change over defined, short-term intervals, typically ranging from a few weeks to a few months. However, the evidence base includes many older studies that may not align with modern diagnostic criteria, and long-term effects are not fully established for sustained management.

Evidence Studies Related to Colic, Acute Spasms, and Excessive Secretions

Donnamar was also evaluated in studies examining ureteral and biliary colic, where acute care research studied short-term symptom changes. Findings were mixed in trials that examined its use alongside standard primary analgesics, with some data showing no measurable difference in the requirement for rescue pain medication. Separately, research was applied in contexts involving systemic imbalance, such as sialorrhea (excessive drooling). Studies monitored physiological strain or stress related to excessive fluid production, and evidence contributes to the broader understanding of secretion management. Comparative evidence is lacking against other contemporary agents for these specialized uses.

Research Limitations and Subgroup Uncertainty

Most available evidence was applied in studies examining short-term symptom patterns; follow-up durations were typically limited. Due to the modest sample sizes in many earlier trials, subgroup findings are uncertain, and data for specific groups, particularly those with complex comorbidities or specific age-related factors, remain insufficient. Research does not determine whether an individual will respond similarly to the group patterns observed, and there remains a need for more contemporary, large-scale RCTs.

Key Studies & References Hyoscyamine Sulfate Sublingual Tablets 0.125 mg - Official Drug Label Information (DailyMed/NIH)

Frequently Asked Questions (FAQ)

Common questions about Donnamar (FAQ)

Q: How does Donnamar compare to older medicines used for the same condition?

The active ingredient in Donnamar is hyoscyamine, a natural plant derivative classified as an anticholinergic. Official information indicates its actions are similar to other related substances like atropine, but it has specific differences in its pharmacological profile.

Q: Is Donnamar a treatment for symptoms or for the underlying cause of the condition?

Regulatory documents describe Donnamar as adjunctive therapy, meaning it is used in addition to primary treatment. Its official use is for the symptomatic relief of conditions, specifically targeting visceral spasm, excessive movement (hypermotility), and secretions.

Q: Does Donnamar have only one approved use, or are there several?

Donnamar is indicated as adjunctive therapy for several conditions. According to regulatory documents, this includes applications for peptic ulcer, Irritable Bowel Syndrome (IBS), functional gastrointestinal disorders, and to control gastrointestinal secretion and spasms.

Q: Is Donnamar intended for long-term use or only short periods?

Usage frequency depends on the specific formulation; immediate-release forms are often prescribed 'as needed.' Official research summarized in regulatory documents is typically based on short-term intervals, and the long-term effects are not fully established for sustained management.

Q: What are the most commonly reported side effects of Donnamar?

Documented effects characteristic of its anticholinergic class include dry mouth, blurred vision, constipation, and dizziness. Official FDA labeling generally groups these adverse reactions by body system but typically does not assign a standardized frequency (like 'common' or 'rare') to the list of reported effects.

Q: Is Donnamar safe for elderly patients, according to regulatory information?

Official documents advise that dose selection for older adults should be cautious and often begin at the lowest established range. This is due to a greater risk of adverse anticholinergic effects like confusion and constipation, as well as the potential for decreased kidney function, which affects drug clearance.

Q: Is it necessary to avoid specific foods or drinks while using Donnamar?

Regulatory information notes that alcohol should be avoided due to the potential for worsening certain side effects. While no specific food groups are strictly forbidden, there is a timing rule for antacids to prevent interference with Donnamar's absorption.

Q: What is the typical or usual duration of treatment with Donnamar?

The duration of treatment varies depending on the medical need and the formulation prescribed; some are taken only 'as needed,' while others follow a fixed schedule. Regulatory evidence is largely derived from short-term trials examining temporary symptom relief, rather than sustained, long-term use.

Q: What should a patient generally expect when Donnamar treatment is stopped?

Official regulatory information does not contain an explicit tapering protocol for discontinuing the medicine. If central nervous system signs like confusion occur, official documents state they typically resolve within 12 to 48 hours after discontinuation. The medication is not classified as a controlled substance associated with dependence.

Q: Why might the effects of Donnamar vary significantly between different people?

According to the research summaries, the data collected in clinical trials reflects general group patterns. Official documents advise that research does not determine whether an individual patient will respond similarly to the group findings, meaning individual patient responses may differ.

Q: Is Donnamar classified as a narcotic or controlled substance?

Regulatory agencies classify the active ingredient in Donnamar (Hyoscyamine Sulfate) as Not a controlled drug under the Controlled Substances Act (CSA). This classification indicates it does not carry the typical risk of dependence or abuse associated with scheduled substances.

Q: What is the difference between the brand name Donnamar and its generic version?

Both the brand name and its generic contain the same active ingredient, hyoscyamine sulfate. The difference between the two lies in the inactive ingredients (such as binders or coloring agents), which can vary between manufacturing processes.

Q: How long has Donnamar been available to patients?

The active component of Donnamar, hyoscyamine, is a natural plant derivative that has been utilized in medicine for many decades. One regulatory document notes over 40 years of marketing experience for the hyoscyamine sulfate salt formulation.

Q: How long does it typically take for the effects of Donnamar to become noticeable?

The onset of effect depends on the route of administration. According to clinical pharmacology information, the effects may be noticeable within a short time (minutes) for sublingual forms, while oral forms typically take longer due to the absorption process.

Q: Is Donnamar considered a cure for the condition it treats?

No. Official labeling and indications describe the medicine as adjunctive therapy or for the symptomatic relief of conditions. It is not classified in regulatory documents as a curative agent.

Q: Does Donnamar commonly cause changes in weight?

Weight change is not specifically listed as an adverse reaction in the official regulatory documents.

Q: Can Donnamar affect liver function or require monitoring?

Official documents focus primarily on renal (kidney) function because the drug is substantially excreted by the kidney. They do not specifically list hepatic (liver) function concerns or required monitoring related to the liver.

Q: Can Donnamar interact with common vitamins or herbal supplements?

While regulatory documents list interactions with specific prescription medications and alcohol, they do not generally list common vitamins or herbal supplements. The regulatory focus is on interactions with prescription medicines and alcohol, rather than common supplements.

Q: Does Donnamar affect the effectiveness of hormonal birth control?

Some regulatory resources state this medication may decrease the effectiveness of hormonal birth control methods, such as pills, patch, or ring. This potential interaction is noted which may result in reduced efficacy of the contraceptive method.

Q: What is generally expected if a patient misses one dose of Donnamar?

Official patient information provides specific instructions on how to proceed if a dose is missed, depending on the proximity of the next scheduled intake. This guidance is intended to help maintain the treatment schedule without doubling a dose.

Q: Do studies suggest Donnamar is widely helpful for the target population?

Research evidence describes patterns of temporary symptom change over defined, short-term intervals for conditions like IBS. However, official reviews also note that findings were mixed in some trials and that long-term effects are not fully established for sustained management.

Q: Is Donnamar approved for use in countries outside of the United States?

Yes, formulations containing the active ingredient hyoscyamine are approved and regulated by government authorities in several international jurisdictions, including countries in Europe, Canada, and Australia.

Q: Is there a risk of developing a physical dependence on Donnamar?

Regulatory classification lists Donnamar as Not a controlled drug under the Controlled Substances Act. This factual classification indicates that it does not carry the typical risk of physical dependence or abuse associated with scheduled substances.

Q: Why is Donnamar only available with a prescription?

The drug's classification as an anticholinergic agent, combined with its potential for serious side effects such as confusion, hallucinations, and decreased sweating (which can lead to heat prostration), necessitates medical supervision. For these reasons, regulatory bodies require it to be available by prescription only.

Q: What kind of non-dosing monitoring is typically recommended while on Donnamar?

Due to specific contraindications and cautions, regulatory documents advise careful use if a patient has pre-existing conditions, such as glaucoma, heart disease, or impaired kidney function. The regulatory documents advise caution with specific pre-existing conditions.

Q: Is Donnamar a type of medicine that must be tapered off gradually?

Official regulatory information does not contain an explicit tapering protocol for discontinuation. While the medicine is not associated with dependence, management of these effects is not explicitly detailed in the official regulatory documents.

Q: Does Donnamar carry a risk of allergic reaction?

Yes, official safety information includes warnings that signs of a serious allergic reaction, such as hives or swelling of the face, tongue, or throat, occur. This information is included in the warnings section of regulatory documents and warrants immediate medical attention.

How should Donnamar be stored and disposed of?

The storage and disposal of Donnamar must strictly follow the official instructions provided on the regulatory label to maintain product quality and safety.

Storage Conditions

The medication must be stored at Controlled Room Temperature, which is officially defined as 20 C to 25 C (68 F to 77 F), with permitted brief temperature variations up to 30 C (86 F). The product must be protected from freezing, excessive heat, and moisture, and the container should be kept tightly closed in its original packaging.

Disposal Instructions

To ensure safety, the medication must be stored out of the reach of children. Unused or expired Donnamar must be disposed of according to federal and local guidelines, such as utilizing a drug take-back program. If a take-back option is unavailable, the product should be mixed with an undesirable substance (e.g., coffee grounds) and placed in a sealed container before being discarded in the household trash, following the recommended FDA procedure.

Attention! Always consult to a doctor or pharmacist before using pills or medicines.

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