VCA Animal Hospitals

Phenoxybenzamine

Why has my veterinarian prescribed this medicine?

Phenoxybenzamine is use to reduce internal urethral sphincter tone. It will allow your pet to pass urine more easily. Phenoxybenzamine is classified as an alpha-adrenergic blocking agent. Phenoxybenzamine may be used for other conditions as determined by your veterinarian.

How do I give this medication?

phenoxybenzamine-1

"DO NOT stop giving this medication to your pet unless directed by your veterinarian."

  • Give this medication to your pet as directed by your veterinarian. READ THE LABEL CAREFULLY.
  • If the medicine is a liquid, measure the dose with reasonable care.
  • Try to give this medication at about the same time each day.
  • If stomach upset occurs, give this medication with food.
  • DO NOT give the pet more medicine than directed and do not give more often than directed.
  • DO NOT stop giving this medication to your pet unless directed by your veterinarian. Call your veterinarian ahead of time if your pet needs a refill.
  • Try not to miss giving any doses.

What if I miss giving a dose?

Give the dose as soon as possible. If it is almost time for the next dose, skip the missed dose, and continue with the regular schedule. Do not give the pet two doses at once.

How do I store this medicine?

  • Keep this medicine out of reach of children.
  • Store this medicine in a cool, dry place at room temperature. Store away from heat and direct sunlight.
  • Do not store this medicine in the bathroom, near the kitchen sink or in damp places. The medicine may break down if exposed to heat or moisture.

What are the potential side effects?

  • The following side effects have been observed: low blood pressure, slow heart rate, weakness, contraction of the pupil, increased intra ocular pressure, nasal congestion, nausea and vomiting.
  • Notify your veterinarian if the following symptoms are noted: weakness, dizziness, collapse after standing, persistent vomiting, or difficulty with seeing.
  • Other side effects may occur. If you notice anything unusual, contact your veterinarian.

Are there any possible drug interactions?

  • Make sure to tell your veterinarian if you are giving your pet any other medication or supplements.
  • Quite often, your veterinarian may prescribe two different medications, and sometimes a drug interaction may be anticipated. If this occurs, your veterinarian may vary the dose and/or monitor your pet more closely.
  • The following drugs can potentially interact with phenoxybenzamine: alpha-adrenergic agonists (e.g. phenylephrine), and epinephrine.
  • Contact your veterinarian if your pet experiences any unusual reactions when different medications are given together.

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