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Generic Name: belladonna alkaloids and phenobarbital (BEL a DON a AL ka loids and FEEN oh BAR bi tal)
Brand Name: Donnatal, D-Tal, Phenohytro
Physician reviewed Phenohytro patient information - includes Phenohytro description, dosage and directions.
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Drug Information:
Phenohytro is made up of belladonna alkaloids (atropine, hyoscyamine, scopolamine) and phenobarbital. Phenohytro is a combination medicine used to treat irritable bowel syndrome and ulcers in the intestine. Phenohytro may also be used for purposes not listed in this medication guide. This medicine may be habit-forming. Misuse can cause addiction, overdose, or death. You should not use Phenohytro if you are allergic to atropine, hyoscyamine, phenobarbital, or scopolamine. You also should not use this medicine if you have: Learn more

Phenohytro Side Effects

Phenohytro Side Effects

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 Phenohytro.

In Summary

More frequent side effects include: constipation and dizziness. See below for a comprehensive list of adverse effects.

For the Consumer

Applies to atropine / hyoscyamine / phenobarbital / scopolamine: oral elixir, oral tablet

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:


  • Eye pain
  • skin rash or hives
  • sore throat and fever
  • unusual bleeding or bruising
  • yellow eyes or skin

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

  • Constipation
  • decreased sweating
  • dizziness
  • dry mouth, nose, throat, or skin

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


Frequency not reported: Tachycardia, palpitation


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


Frequency not reported: Xerostomia, constipation, bloated feeling

Nervous system

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


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)


Frequency not reported: Musculoskeletal pain


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


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


Frequency not reported: Megaloblastic anemia


Frequency not reported: Weakness

Editorial References and Review

Medically reviewed by BestRx Medical Team Last updated on 1/1/2020.

Source: Drugs.com Phenohytro