Terazosin: Uses, Dosing, Side Effects, and Safety Tips
Terazosin is a prescription alpha‑1 blocker used mainly for enlarged prostate (BPH) and sometimes for high blood pressure. It relaxes smooth muscle in the prostate and bladder neck so urine flows easier, and it widens blood vessels to lower blood pressure. That makes it handy when someone has both BPH and hypertension.
Typical starting doses are low—often 1 mg at bedtime for BPH or 1 mg once daily for blood pressure—then your doctor increases the dose slowly. Many people take the pill at night to reduce the chance of dizziness from the first doses. Follow your prescriber’s schedule; don’t double up if you miss a dose and don’t stop suddenly without checking in with your clinician.
What to expect and common side effects
The most common side effects are lightheadedness, especially when standing up (orthostatic hypotension), drowsiness, headache, nasal congestion, and sometimes weakness. Men may notice changes in ejaculation. These usually show up after starting or after a dose increase and often improve over days to weeks. If you feel faint, lie down and call your doctor—severe drops in blood pressure need prompt attention.
Drug interactions and precautions
Terazosin can add to the blood‑pressure lowering effect of other medications. Be careful with other antihypertensives, nitrates, and drugs for erectile dysfunction like sildenafil; combining them can cause a big drop in blood pressure. Alcohol can magnify dizziness. Tell your doctor about all medicines, including herbal supplements and over‑the‑counter pills.
Older adults are more sensitive to orthostatic effects, so doctors usually start lower and go slower. If you have liver problems, mention that—your provider will decide if terazosin is right for you. Pregnant or breastfeeding people should not use terazosin unless a doctor advises it, as safety hasn’t been established.
How to take it: swallow tablets whole. Taking terazosin at night can reduce first‑dose fainting. Stand up slowly from sitting or lying down, especially after the first few doses. Keep a home blood pressure monitor if you’re using it for hypertension, and record readings for your clinician.
When to call the doctor: severe dizziness, fainting, chest pain, fast heartbeat, or signs of allergic reaction (rash, swelling, trouble breathing). Also report persistent sexual side effects or a sudden change in urinary symptoms. Your provider may need to adjust the dose or switch medications.
Terazosin is available as generic and under brand names like Hytrin. It’s a prescription drug—avoid buying from unverified online sellers. Use licensed pharmacies, check for UK or local regulatory approvals, and never use someone else’s prescription. If cost is an issue, ask your clinician about lower‑cost generics or patient assistance programs.
If you want a quick checklist to bring to your appointment: current meds, blood pressure readings, urinary symptoms, any dizziness or fainting, and questions about sexual side effects. That makes the visit focused and helps your clinician choose the safest, most effective plan.
Bring a list of allergies and previous surgeries to help your prescriber personalize treatment and avoid complications today.
