The following side effects may get better over time as your body gets used to the medication. Let your healthcare provider know immediately if you continue to experience these symptoms or if they worsen over time.
Common Side Effects
Immediate-release tablets
- Dizziness (16-19%)
- Fatigue (8-12%)
Extended-release tablets
- Headache (6%)
- Dizziness (5%)
- Respiratory tract infection (5%)
- Feeling weak (4%)
Less Common Side Effects
Immediate-release tablets
- Sleepiness
- Low blood pressure
- Shortness of breath
- Dry mouth
- Swelling
Extended-release tablets
- Stomach pain
- Low blood pressure
- Indigestion
- Nausea
- Muscle pain
- Sleepiness
- Shortness of breath
- Urinary tract infection
Doxazosin serious side effects
Contact your healthcare provider immediately if you experience any of the following.
- Priapism: painful erection lasting more than 4 hours
Source: DailyMed
The following Doxazosin side effects have also been reported
Along with its needed effects, a medicine may cause some unwanted effects. Although not all of these side effects may occur, if they do occur they may need medical attention.
Check with your doctor as soon as possible if any of the following side effects occur:
More common
Dizziness or lightheadedness
Less common
Blurred vision
confusion
dizziness, faintness, or lightheadedness when getting up from a lying or sitting position
fainting (sudden)
fast and pounding heartbeat
irregular heartbeat
shortness of breath
sweating
swelling of feet or lower legs
Rare
Painful or prolonged erection of the penis (called priapism), although extremely rare, must have immediate medical attention. If painful or prolonged erection occurs, call your doctor or go to an emergency room as soon as possible
Incidence not known
Abdominal or stomach pain
area rash
black, tarry stools
bleeding gums
blood in urine or stools
chest pain or discomfort
chills
clay-colored stools
dark urine
difficulty breathing
difficult, burning, or painful urination
general tiredness and weakness
headache, sudden and severe
inability to speak
lab results that show problems with liver
light-colored stools
loss of appetite
noisy breathing
pain or discomfort in arms, jaw, back or neck
pinpoint red or purple spots on skin
rash
seizures
slow or irregular heartbeat
slurred speech
sores, ulcers, or white spots on lips or in mouth
swollen glands
temporary blindness
tightness in chest
unpleasant breath odor
unusual bleeding or bruising
upper right abdominal pain
vomiting
vomiting of blood
weakness in arm and/or leg on one side of the body, sudden and severe
yellow eyes and skin
Some side effects may occur that usually do not need medical attention. These side effects may go away during treatment as your body adjusts to the medicine. Also, your health care professional may be able to tell you about ways to prevent or reduce some of these side effects. Check with your health care professional if any of the following side effects continue or are bothersome or if you have any questions about them:
More common
Headache
lack or loss of strength
unusual tiredness or weakness
Less common
Acid or sour stomach
back pain
belching
bladder pain
cloudy urine
difficulty in moving
frequent urge to urinate
indigestion
joint pain
lower back or side pain
muscle aching, cramping, or weakness
muscle pains or stiffness
nervousness, restlessness, unusual irritability
sleepiness or drowsiness
stomach discomfort, upset or pain
swollen joints
Incidence not known
burning, crawling, itching, numbness, prickling, “pins and needles”, or tingling feeling
change in frequency or urination
feeling of warmth
general feeling of discomfort or illness
hives or welts
hyperventilation
increased urge to urinate during the night
increased volume of pale dilute urine
loss of appetite
redness of skin
redness of the face, neck, arms and occasionally upper chest
shaking
swelling of the breasts or breast soreness in both females and males
thinning of hair
trouble in holding or releasing urine
trouble sleeping
waking to urinate at night
Other side effects not listed may also occur in some patients. If you notice any other effects, check with your healthcare professional.
Call your doctor for medical advice about side effects. You may report side effects to the FDA at 1-800-FDA-1088.
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