Generic name: Terazosin hydrochloride.

Hytrin is an alpha-blocker/antihypertensive. It lowers blood pressure by relaxing the muscle tissue of the blood vessels.  

Quick Facts About HytrinHytrin 5mg


Used to treat high blood pressure. Also used to treat the symptoms of enlargement of the prostate gland.

Hytrin Dosage

Take initial dose at bedtime; do not take more than your doctor has prescribed. May take with or without food. May take weeks to observe results if taking for high blood pressure; must continue to take even if you feel better.

  • Usual adult dose:  1 milligram at bedtime, up to 5 milligrams per day. Some are prescribed up to 20 milligrams per day. For enlarged prostate — 1 milligram per day at bedtime, gradually increased up to 10 milligrams per day for 4 to 6 weeks. Some are prescribed 20 milligrams per day.
  • Usual child dose: not generally prescribed for children.
  • Missed dose: take as soon as possible, unless almost time for next dose. In that case, do not take missed dose, go back to regular schedule. Do not double doses.

Hytrin Side Effects

Overdose symptoms:

dizziness, light-headedness, shock. If you suspect an overdose, immediately seek medical attention.

More common side effects: difficult or labored breathing, dizziness, headache, heart palpitations, lightheadedness when standing, nausea, pain in arms and legs, sleepiness, stuffy nose, swollen wrists and ankles, weakness. May require higher dosage if these side effects persist.

Less common or rare Hytrin side effects: anxiety, back pain, blurred vision, bronchitis, conjunctivitis (pink eye), constipation, decreased sex drive, depression, diarrhea, dimmed vision, dry mouth, facial swelling, fainting, fever, flu or cold symptoms, fluid retention, frequent urination, gas, gout, impotence, inability to hold urine, increased heart rate, indigestion, inflamed sinuses, insomnia, irregular heartbeat, itching, joint pain and inflammation, low blood pressure, muscle aches, nasal inflammation, nervousness, nosebleed, numbness or tingling pain (in abdomen, chest, neck, or shoulder), rash, ringing in ears, severe allergic reaction, sweating, urinary tract infection, vertigo, vision changes, vomiting, weight gain.


Inform your doctor before combining Hytrin with:

nonsteroidal anti-inflammatory painkillers such as Motrin and Naprosyn; other blood pressure medications such as Dyazide, Vasotec, Calan, and Verelan.

No known food/other substance interactions. 

Special Cautions

If pregnant or planning to become pregnant, inform your doctor immediately. Not known whether Hytrin appears in breast milk.

No special precautions apply to seniors.

Not generally prescribed for children.

  • Do not take if sensitive to or allergic to Hytrin.
  • May faint due to low blood pressure when taking Hytrin.
  • Avoid driving and participating in potentially hazardous activities: for 12 hours after the first dose; with each new dosage increase; and when Hytrin is restarted after discontinuance.
  • If taking for enlarged prostate, it may continue to grow. Can experience prostate cancer with enlarged prostate.


HealthSurvey.org provides accurate and independent information prescription pills, over-the-counter medicines and natural products. This material is provided for educational purposes only and is not intended for medical advice, diagnosis or treatment. If you have questions about  dosage, or Hytrin side effects, please contact your healthcare provider.