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Wytensin Oral

Generic Name: GUANABENZ - ORAL
Pronounced: (GWAN-uh-benz)

Wytensin Oral Side Effects

Drowsiness, dry mouth, dizziness, and weakness may occur. Less common side effects may include headache, stuffy nose, dry eyes, blurred vision, nausea, vomiting, stomach pain/discomfort, diarrhea, constipation, and unusual taste in the mouth. If any of these effects persist or worsen, tell your doctor or pharmacist promptly.

To relieve dry mouth, suck on (sugarless) hard candy or ice chips, chew (sugarless) gum, drink water, or use a saliva substitute. To help prevent constipation, eat adequate fiber, drink plenty of fluids, and exercise. If constipation occurs, ask your pharmacist for help selecting a laxative.

Remember that your doctor has prescribed this medication because he or she has judged that the benefit to you is greater than the risk of side effects. Many people using this medication do not have serious side effects.

Tell your doctor immediately if any of these unlikely but serious side effects occur:

  • unusual sweating
  • unusually slow heartbeat
  • sudden pounding heartbeat
  • decreased sexual ability/interest
  • muscle pain
  • increase in urine
  • enlargement of breasts
  • depression


A very serious allergic reaction to this drug is rare. However, seek immediate medical attention if you notice any symptoms of a serious allergic reaction, including:

  • rash
  • itching
  • swelling
  • severe dizziness
  • trouble breathing


This is not a complete list of possible side effects. If you notice other effects not listed above, contact your doctor or pharmacist.

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