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Amdry-C Disease Interactions

There are 27 disease interactions with Amdry-C (chlorpheniramine / methscopolamine / pseudoephedrine).

Major

Anticholinergics (applies to Amdry-C) autonomic neuropathy

Major Potential Hazard, High plausibility.

Agents with anticholinergic activity can exacerbate many of the manifestations of autonomic neuropathy, including tachycardia, anhidrosis, bladder atony, obstipation, dry mouth and eyes, cycloplegia and blurring of vision, and sexual impotence in males. Therapy with antimuscarinic agents and higher dosages of antispasmodic agents (e.g., dicyclomine or oxybutynin) should be administered cautiously in patients with autonomic neuropathy.

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Major

Anticholinergics (applies to Amdry-C) GI obstruction

Major Potential Hazard, High plausibility. Applicable conditions: Esophageal Obstruction, Gastrointestinal Obstruction

Anticholinergics are contraindicated in patients with obstructive diseases such as achalasia, esophageal stricture or stenosis, pyloroduodenal stenosis, stenosing peptic ulcer, pyloric obstruction, and paralytic ileus. Anticholinergics may further suppress intestinal motility with resultant precipitation or aggravation of toxic megacolon.

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Major

Anticholinergics (applies to Amdry-C) glaucoma

Major Potential Hazard, High plausibility. Applicable conditions: Glaucoma/Intraocular Hypertension

Anticholinergic agents are contraindicated in patients with primary glaucoma, a tendency toward glaucoma (narrow anterior chamber angle), or adhesions (synechiae) between the iris and lens, as well as for the elderly and others in whom undiagnosed glaucoma or excessive pressure in the eye may be present. Because anticholinergics cause mydriasis, they may exacerbate these conditions.

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Major

Anticholinergics (applies to Amdry-C) obstructive uropathy

Major Potential Hazard, High plausibility. Applicable conditions: Urinary Retention

In general, the use of anticholinergic agents is contraindicated in patients with urinary retention and bladder neck obstruction caused by prostatic hypertrophy. Dysuria may occur and may require catheterization. Also, anticholinergic drugs may aggravate partial obstructive uropathy. Caution is advised even when using agents with mild to moderate anticholinergic activity, particularly in elderly patients.

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Major

Anticholinergics (applies to Amdry-C) reactive airway diseases

Major Potential Hazard, Moderate plausibility. Applicable conditions: Asthma

The use of systemic anticholinergics is contraindicated in the treatment of lower respiratory tract symptoms including asthma. Muscarinic receptor antagonists reduce bronchial secretions, which can result in decreased fluidity and increased thickening of secretions. However, ipratropium does not produce these effects and can be used safely in treating asthma.

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Major

Antimuscarinics (applies to Amdry-C) myasthenia gravis

Major Potential Hazard, Moderate plausibility.

Because antimuscarinic agents have anticholinergic effects, they are contraindicated in patients with myasthenia gravis. Their use may be appropriate to reduce adverse muscarinic effects caused by an anticholinesterase agent.

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Major

Antiperistaltic agents (applies to Amdry-C) infectious diarrhea

Major Potential Hazard, High plausibility. Applicable conditions: Infectious Diarrhea/Enterocolitis/Gastroenteritis

The use of drugs with antiperistaltic activity (primarily antidiarrheal and antimuscarinic agents, but also antispasmodic agents such as dicyclomine or oxybutynin at high dosages) is contraindicated in patients with diarrhea due to pseudomembranous enterocolitis or enterotoxin-producing bacteria. These drugs may prolong and/or worsen diarrhea associated with organisms that invade the intestinal mucosa, such as toxigenic E. coli, Salmonella and Shigella, and pseudomembranous colitis due to broad-spectrum antibiotics. Other symptoms and complications such as fever, shedding of organisms and extraintestinal illness may also be increased or prolonged. In general, because antiperistaltic agents decrease gastrointestinal motility, they may delay the excretion of infective gastroenteric organisms or toxins and should be used cautiously in patients with any infectious diarrhea, particularly if accompanied by high fever or pus or blood in the stool. Some cough and cold and other combination products may occasionally include antimuscarinic agents for their drying effects and may, therefore, require careful selection when necessary.

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Major

Sympathomimetics (applies to Amdry-C) cardiovascular disease

Major Potential Hazard, High plausibility. Applicable conditions: Cerebrovascular Insufficiency, Hyperthyroidism, Pheochromocytoma

Sympathomimetic agents may cause adverse cardiovascular effects, particularly when used in high dosages and/or in susceptible patients. In cardiac tissues, these agents may produce positive chronotropic and inotropic effects via stimulation of beta- 1 adrenergic receptors. Cardiac output, oxygen consumption, and the work of the heart may be increased. In the peripheral vasculature, vasoconstriction may occur via stimulation of alpha-1 adrenergic receptors. Palpitations, tachycardia, arrhythmia, hypertension, reflex bradycardia, coronary occlusion, cerebral vasculitis, myocardial infarction, cardiac arrest, and death have been reported. Some of these agents, particularly ephedra alkaloids (ephedrine, ma huang, phenylpropanolamine), may also predispose patients to hemorrhagic and ischemic stroke. Therapy with sympathomimetic agents should generally be avoided or administered cautiously in patients with sensitivity to sympathomimetic amines, hyperthyroidism, or underlying cardiovascular or cerebrovascular disorders. These agents should not be used in patients with severe coronary artery disease or severe/uncontrolled hypertension.

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Moderate

Anticholinergics (applies to Amdry-C) cardiac disease

Moderate Potential Hazard, Moderate plausibility. Applicable conditions: Cardiovascular Disease

Anticholinergics block vagal inhibition of the SA nodal pacemaker. Therapy with anticholinergics should be administered cautiously to patients with tachycardia, congestive heart failure, or coronary artery disease. Premature ventricular depolarization, ventricular tachycardia, and fibrillation associated with anticholinergics are rare.

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Moderate

Anticholinergics (applies to Amdry-C) tachycardia

Moderate Potential Hazard, Moderate plausibility. Applicable conditions: Arrhythmias

Anticholinergics block vagal inhibition of the SA nodal pacemaker. Therapy with anticholinergics should be administered cautiously in patients with tachycardia, congestive heart failure, or coronary artery disease. Premature ventricular depolarization or ventricular tachycardia or fibrillation associated with anticholinergics is rare.

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Moderate

Antihistamines (applies to Amdry-C) anticholinergic effects

Moderate Potential Hazard, Moderate plausibility. Applicable conditions: Gastrointestinal Obstruction, Urinary Retention, Glaucoma/Intraocular Hypertension

Antihistamines often have anticholinergic activity, to which elderly patients are particularly sensitive. Therapy with antihistamines should be administered cautiously, if at all, in patients with preexisting conditions that are likely to be exacerbated by anticholinergic activity, such as urinary retention or obstruction; angle-closure glaucoma, untreated intraocular hypertension, or uncontrolled primary open-angle glaucoma; and gastrointestinal obstructive disorders. Conventional, first-generation antihistamines such as the ethanolamines (bromodiphenhydramine, carbinoxamine, clemastine, dimenhydrinate, diphenhydramine, doxylamine, phenyltoloxamine) tend to exhibit substantial anticholinergic effects. In contrast, the newer, relatively nonsedating antihistamines (e.g., cetirizine, fexofenadine, loratadine) reportedly have low to minimal anticholinergic activity at normally recommended dosages and may be appropriate alternatives.

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Moderate

Antihistamines (applies to Amdry-C) asthma/COPD

Moderate Potential Hazard, Moderate plausibility. Applicable conditions: Chronic Obstructive Pulmonary Disease

It has been suggested that the anticholinergic effect of antihistamines may reduce the volume and cause thickening of bronchial secretions, resulting in obstruction of respiratory tract. Some manufacturers and clinicians recommend that therapy with antihistamines be administered cautiously in patients with asthma or chronic obstructive pulmonary disease.

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Moderate

Antihistamines (applies to Amdry-C) cardiovascular

Moderate Potential Hazard, Moderate plausibility. Applicable conditions: Cardiovascular Disease, Hyperthyroidism, Hypotension

Antihistamines may infrequently cause cardiovascular adverse effects related to their anticholinergic and local anesthetic (quinidine-like) activities. Tachycardia, palpitation, ECG changes, arrhythmias, hypotension, and hypertension have been reported. Although these effects are uncommon and usually limited to overdosage situations, the manufacturers and some clinicians recommend that therapy with antihistamines be administered cautiously in patients with cardiovascular disease, hypertension, and/or hyperthyroidism.

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Moderate

Antihistamines (applies to Amdry-C) renal/liver disease

Moderate Potential Hazard, High plausibility. Applicable conditions: Renal Dysfunction

Limited pharmacokinetic data are available for the older, first-generation antihistamines. Many appear to be primarily metabolized by the liver, and both parent drugs and metabolites are excreted in the urine. Patients with renal and/or liver disease may be at greater risk for adverse effects from antihistamines due to drug and metabolite accumulation. Therapy with antihistamines should be administered cautiously in such patients. Lower initial dosages may be appropriate.

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Moderate

Antimuscarinics (applies to Amdry-C) coronary artery disease

Moderate Potential Hazard, Moderate plausibility. Applicable conditions: Arrhythmias, Ischemic Heart Disease

Antimuscarinic agents block vagal inhibition of the SA nodal pacemaker. These agents should be administered cautiously in patients with tachycardia, congestive heart failure, or coronary artery disease. Premature ventricular depolarization or ventricular tachycardia or fibrillation associated with antimuscarinic drugs is rare.

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Moderate

Antimuscarinics (applies to Amdry-C) gastric ulcer

Moderate Potential Hazard, Low plausibility. Applicable conditions: Bleeding

Antimuscarinic agents may cause a delay in gastric emptying and possibly antral stasis in patients with gastric ulcer. Therapy with antimuscarinic agents should be administered cautiously to patients with gastric ulcer.

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Moderate

Antimuscarinics (applies to Amdry-C) gastroesophageal reflux

Moderate Potential Hazard, Moderate plausibility. Applicable conditions: Gastroesophageal Reflux Disease

Antimuscarinic agents decrease gastric motility and relax the lower esophageal sphincter which promotes gastric retention and can aggravate reflux. These drugs should be administered cautiously in patients with gastroesophageal reflux or hiatal hernia associated with reflux esophagitis.

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Moderate

Antimuscarinics (applies to Amdry-C) ulcerative colitis

Moderate Potential Hazard, Moderate plausibility.

Antimuscarinic agents may suppress intestinal motility and produce paralytic ileus with resultant precipitation of toxic megacolon. These drugs should be administered cautiously to patients with ulcerative colitis.

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Moderate

Pseudoephedrine (applies to Amdry-C) GI narrowing

Moderate Potential Hazard, Moderate plausibility. Applicable conditions: Gastrointestinal Obstruction

The extended-release formulation of pseudoephedrine (Sudafed 24 Hour) contains a non-deformable material. There have been rare reports of obstructive symptoms in patients with known strictures following the ingestion of similar sustained-release products. Therapy with the extended-release formulation of pseudoephedrine should be administered cautiously in patients with preexisting severe gastrointestinal narrowing or obstruction, whether pathologic or iatrogenic.

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Moderate

Pseudoephedrine (applies to Amdry-C) PKU

Moderate Potential Hazard, High plausibility. Applicable conditions: Phenylketonuria

Chewable products frequently may contain aspartame, which is metabolized in the gastrointestinal tract to phenylalanine. Sudafed (brand of pseudoephedrine) chewable 15 mg tablets provide the equivalent of 0.78 mg of phenylalanine per each tablet. The aspartame/phenylalanine content should be considered when this and similar products are used in patients who must restrict their intake of phenylalanine (i.e. phenylketonurics).

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Moderate

Sympathomimetics (applies to Amdry-C) BPH

Moderate Potential Hazard, High plausibility. Applicable conditions: Benign Prostatic Hyperplasia, Prostate Tumor

Sympathomimetic agents may cause or worsen urinary difficulty in patients with prostate enlargement due to smooth muscle contraction in the bladder neck via stimulation of alpha-1 adrenergic receptors. Therapy with sympathomimetic agents should be administered cautiously in patients with hypertrophy or neoplasm of the prostate.

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Moderate

Sympathomimetics (applies to Amdry-C) diabetes

Moderate Potential Hazard, Moderate plausibility. Applicable conditions: Diabetes Mellitus

Sympathomimetic agents may cause increases in blood glucose concentrations. These effects are usually transient and slight but may be significant with dosages higher than those normally recommended. Therapy with sympathomimetic agents should be administered cautiously in patients with diabetes mellitus. Closer monitoring of blood glucose concentrations may be appropriate.

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Moderate

Sympathomimetics (applies to Amdry-C) glaucoma

Moderate Potential Hazard, Moderate plausibility. Applicable conditions: Glaucoma/Intraocular Hypertension

Sympathomimetic agents can induce transient mydriasis via stimulation of alpha-1 adrenergic receptors. In patients with anatomically narrow angles or narrow-angle glaucoma, pupillary dilation can provoke an acute attack. In patients with other forms of glaucoma, mydriasis may occasionally increase intraocular pressure. Therapy with sympathomimetic agents should be administered cautiously in patients with or predisposed to glaucoma, particularly narrow-angle glaucoma.

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Minor

Anticholinergics (applies to Amdry-C) hypertension

Minor Potential Hazard, Low plausibility.

Cardiovascular effects of anticholinergics may exacerbate hypertension. Therapy with anticholinergic agents should be administered cautiously in patients with hypertension.

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Minor

Anticholinergics (applies to Amdry-C) hyperthyroidism

Minor Potential Hazard, Low plausibility.

In general, agents with anticholinergic activity may exacerbate hyperthyroidism. Therapy with anticholinergics should be administered cautiously in patients with hyperthyroidism. Thyroid levels should be monitored if usage is prolonged.

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Minor

Antimuscarinics (applies to Amdry-C) diarrhea

Minor Potential Hazard, Moderate plausibility.

Diarrhea may be a symptom of incomplete intestinal obstruction, especially in patients with ileostomy or colostomy. Antimuscarinic agents may further aggravate the diarrhea. Therefore, these drugs should be administered cautiously in patients with diarrhea.

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Minor

Atropine-like agents (applies to Amdry-C) fever

Minor Potential Hazard, Low plausibility.

Atropine-like agents may increase the risk of hyperthermia in patients with fever by producing anhidrosis. Therapy with atropine-like agents should be administered cautiously in febrile patients.

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Amdry-C drug interactions

There are 530 drug interactions with Amdry-C (chlorpheniramine / methscopolamine / pseudoephedrine).

Amdry-C alcohol/food interactions

There are 2 alcohol/food interactions with Amdry-C (chlorpheniramine / methscopolamine / pseudoephedrine).


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Drug Interaction Classification

These classifications are only a guideline. The relevance of a particular drug interaction to a specific individual is difficult to determine. Always consult your healthcare provider before starting or stopping any medication.
Major Highly clinically significant. Avoid combinations; the risk of the interaction outweighs the benefit.
Moderate Moderately clinically significant. Usually avoid combinations; use it only under special circumstances.
Minor Minimally clinically significant. Minimize risk; assess risk and consider an alternative drug, take steps to circumvent the interaction risk and/or institute a monitoring plan.
Unknown No interaction information available.

Further information

Always consult your healthcare provider to ensure the information displayed on this page applies to your personal circumstances.