Skip to Content

Alkabel-SR Side Effects

Generic Name: atropine / hyoscyamine / phenobarbital / scopolamine

Note: This document contains side effect information about atropine / hyoscyamine / phenobarbital / scopolamine. Some of the dosage forms listed on this page may not apply to the brand name Alkabel-SR.

For the Consumer

Applies to atropine / hyoscyamine / phenobarbital / scopolamine: oral capsule, oral elixir, oral liquid, oral tablet, oral tablet extended release

Along with its needed effects, atropine/hyoscyamine/phenobarbital/scopolamine may cause some unwanted effects. Although not all of these side effects may occur, if they do occur they may need medical attention.

Check with your doctor immediately if any of the following side effects occur while taking atropine/hyoscyamine/phenobarbital/scopolamine:


Some side effects of atropine / hyoscyamine / phenobarbital / scopolamine may occur that usually do not need medical attention. These side effects may go away during treatment as your body adjusts to the medicine. Also, your health care professional may be able to tell you about ways to prevent or reduce some of these side effects. Check with your health care professional if any of the following side effects continue or are bothersome or if you have any questions about them:

More common Less common or rare
  • Bloated feeling
  • blurred vision
  • decreased flow of breast milk
  • difficult urination
  • difficulty in swallowing
  • headache
  • increased sensitivity of eyes to sunlight
  • loss of memory
  • nausea or vomiting
  • unusual tiredness or weakness

For Healthcare Professionals

Applies to atropine / hyoscyamine / phenobarbital / scopolamine: oral capsule, oral elixir, oral liquid, oral tablet, oral tablet extended release


Frequency not reported: Urinary hesitancy and retention, impotence, suppression of lactation[Ref]


Frequency not reported: Tachycardia, palpitation[Ref]


Frequency not reported: Blurred vision, mydriasis, cycloplegia, increased ocular tension[Ref]


Frequency not reported: Xerostomia, constipation, bloated feeling[Ref]

Nervous system

Frequency not reported: Loss of taste sense, headache, drowsiness, dizziness, convulsions[Ref]


Frequency not reported: Severe allergic reaction or drug idiosyncrasies (including anaphylaxis, urticaria, and other dermal manifestations), acquired hypersensitivity (reactions include localized swelling, particularly of eyelids, cheeks, or lips, and erythematous dermatitis)[Ref]


Frequency not reported: Musculoskeletal pain[Ref]


Frequency not reported: Nervousness, insomnia, excitement, delirium, agitation (elderly patients)[Ref]


Frequency not reported: Decreased sweating, exfoliative dermatitis (e.g. Stevens-Johnson syndrome, toxic epidermal necrolysis)[Ref]


Frequency not reported: Megaloblastic anemia[Ref]


Frequency not reported: Weakness[Ref]


1. "Product Information. Donnatal (atropine/hyoscyamine/PB/scopolamine)." Concordia Pharmaceuticals, LaVergne, TN.

2. "Product Information. Belladonna-PHENobarbital (atropine/hyoscyamine/PB/scopolamine)." West-Ward Pharmaceutical Corporation, Eatontown, NJ.

Some side effects of Alkabel-SR may not be reported. Always consult your doctor or healthcare specialist for medical advice. You may also report side effects to the FDA.

Disclaimer: Every effort has been made to ensure that the information provided is accurate, up-to-date and complete, but no guarantee is made to that effect. In addition, the drug information contained herein may be time sensitive and should not be utilized as a reference resource beyond the date hereof. This material does not endorse drugs, diagnose patients, or recommend therapy. This information is a reference resource designed as supplement to, and not a substitute for, the expertise, skill , knowledge, and judgement of healthcare practitioners in patient care. The absence of a warning for a given drug or combination thereof in no way should be construed to indicate safety, effectiveness, or appropriateness for any given patient. does not assume any responsibility for any aspect of healthcare administered with the aid of materials provided. The information contained herein is not intended to cover all possible uses, directions, precautions, warnings, drug interactions, allergic reactions, or adverse effects. If you have questions about the substances you are taking, check with your doctor, nurse, or pharmacist.