Complete adverse effect profile including incidence rates and management
Important Safety Information
This is not a complete list of all possible side effects. Contact your healthcare provider if you experience any unexpected symptoms. For serious or life-threatening side effects, seek emergency medical attention immediately.
ADVERSE REACTIONS Benign Prostatic Hyperplasia The incidence of treatment-emergent adverse events has been ascertained from clinical trials conducted worldwide.
All adverse events reported during these trials were recorded as adverse reactions.
The incidence rates presented below are based on combined data from six placebo-controlled trials involving once-a-day administration of terazosin at doses ranging from 1 to 20 mg.
Table 1 summarizes those adverse events reported for patients in these trials when the incidence rate in the terazosin group was at least 1%, and was greater than that for the placebo group, or where the reaction is of clinical interest.
Asthenia, postural hypotension, dizziness, somnolence, nasal congestion/rhinitis, and impotence were the only events that were significantly (p ≤ 0.05) more common in patients receiving terazosin than in patients receiving placebo.
The incidence of urinary tract infection was significantly lower in the patients receiving terazosin than in patients receiving placebo.
An analysis of the incidence rate of hypotensive adverse events (see PRECAUTIONS ) adjusted for the length of drug treatment has shown that the risk of the events is greatest during the initial seven days of treatment, but continues at all time intervals.
Adverse Reactions During Placebo-Controlled Trials Benign Prostatic Hyperplasia Body System Terazosin (N = 636) Placebo (N = 360) BODY AS A WHOLE Includes weakness, tiredness, lassitude, and fatigue.
Asthenia Flu Syndrome Headache 7.4% p ≤ 0.05 comparison between groups.
2.4% 4.9% 3.3% 1.7% 5.8% CARDIOVASCULAR SYSTEM Hypotension Palpitations Postural Hypotension Syncope 0.6% 0.9% 3.9% 0.6% 0.6% 1.1% 0.8% 0.0% DIGESTIVE SYSTEM Nausea 1.7% 1.1% METABOLIC AND NUTRITIONAL DISORDERS Peripheral Edema Weight Gain 0.9% 0.5% 0.3% 0.0% NERVOUS SYSTEM Dizziness Somnolence Vertigo 9.1% 3.6% 1.4% 4.2% 1.9% 0.3% RESPIRATORY SYSTEM Dyspnea Nasal Congestion/Rhinitis 1.7% 1.9% 0.8% 0.0% SPECIAL SENSES Blurred Vision/Amblyopia 1.3% 0.6% UROGENITAL SYSTEM Impotence Urinary Tract Infection 1.6% 1.3% 0.6% 3.9% Additional adverse events have been reported, but these are, in general, not distinguishable from symptoms that might have occurred in the absence of exposure to terazosin.
WARNINGS Syncope and “First-dose” Effect Terazosin capsules, like other alpha-adrenergic blocking agents, can cause marked lowering of blood pressure, especially postural hypotension, and syncope in association with the first dose or first few days of therapy.
A similar effect can be anticipated if therapy is interrupted for several days and then restarted.
Syncope has also been reported with other alpha-adrenergic blocking agents in association with rapid dosage increases or the introduction of another antihypertensive drug.
Syncope is believed to be due to an excessive postural hypotensive effect, although occasionally the syncopal episode has been preceded by a bout of severe supraventricular tachycardia with heart rates of 120 to 160 beats per minute.
Additionally, the possibility of the contribution of hemodilution to the symptoms of postural hypotension should be considered.
Like all medications, Terazosin can cause side effects. However, not everyone who takes this medication will experience them. Many side effects are dose-dependent and may improve as your body adjusts to the medication. Others may require dose adjustment or medical attention.
Contact your healthcare provider promptly if you experience:
Seek immediate emergency medical care if you experience signs of: