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 or nurse immediately if any of the following side effects occur:
More common
Haloperidol®
Excessive muscle tone
inability to move the eyes
increase in body movements
increased blinking or spasms of the eyelid
muscle stiffness, tension, or tightness
sleepiness or unusual drowsiness
sticking out of the tongue
tremor
trouble with breathing, speaking, or swallowing
uncontrolled twisting movements of the neck, trunk, arms, or legs
unusual facial expressions
Haloperidol® Decanoate
Difficulty swallowing
fixed position of the eye
loss of balance control
mask-like face
shuffling walk
slowed movements
slurred speech
stiffness of the arms and legs
tic-like or jerky movements of the head, face, mouth, and neck
trembling and shaking of the fingers and hands
Less common
Haloperidol®
Slow movement and reflexes
Haloperidol® Decanoate
Absence of or decrease in body movement
inability to sit still
need to keep moving
restlessness
Rare (both)
Blurred vision
confusion
difficulty opening the mouth
dizziness
dizziness, faintness, or lightheadedness when getting up suddenly from a lying or sitting position
fainting
fast, pounding, or irregular heartbeat or pulse
high fever
high or low blood pressure
increased sweating
lightheadedness
lockjaw
loss of bladder control
muscle spasm, especially of the neck and back
muscle twitching
seizures
severe muscle stiffness
uncontrolled eye movements
unusual tiredness or weakness
unusually pale skin
Incidence not known (both)
Anxiety
black, tarry stools
bleeding, blistering, burning, coldness, discoloration of the skin, feeling of pressure, hives, infection, inflammation, itching, lumps, numbness, pain, rash, redness, scarring, soreness, stinging, swelling, tenderness, tingling, or warmth at the injection site
chest pain
chills
clay-colored stools
cold sweats
continuing nausea or vomiting
cool, pale skin
cough
dark urine
decrease in the frequency of urination
deep or fast breathing with dizziness
depression
difficulty in passing urine (dribbling)
drooling
dry mouth
eye pain
false or unusual sense of well-being
fever with or without chills
flushed, dry skin
fruit-like breath odor
general feeling of illness, tiredness, or weakness
headache
hoarseness
hot, dry skin
increase in the frequency of seizures
increased hunger
increased thirst
increased urination
irregular heartbeat, recurrent
irritability
itching, skin rash
lack of sweating
large, hive-like swelling on the face, eyelids, lips, tongue, throat, hands, legs, feet, or genitals
lip smacking or puckering
loss of appetite
loss of consciousness
lower back or side pain
muscle weakness
muscle pain or cramps
muscle trembling or jerking
nausea
nervousness
nightmares
noisy breathing
numbness of the feet, hands, and around the mouth
painful or difficult urination
pale skin
pounding in the ears
puffing of the cheeks
rapid or worm-like movements of the tongue
shakiness
shuffling walk
sore throat
sores, ulcers, or white spots on the lips or in the mouth
stomach pain
swelling of the face, ankles, or hands
swollen glands
tightness in the chest
total body jerking
trouble with sleeping
troubled breathing with exertion
twisting movements of the body
uncontrolled chewing movements
unexplained weight loss
unpleasant breath odor
unusual bleeding or bruising
unusual dullness, tiredness, weakness, or feeling of sluggishness
vomiting
vomiting of blood
weakness of the arms and legs
yellow eyes or 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:
Less common
Haloperidol®
Constipation
increased watering of the mouth
Rare (both)
Absent, missed, or irregular menstrual periods
acne, pimples
breast discomfort
cramps
decreased interest in sexual intercourse
heavy bleeding
inability to have or keep an erection
increased weight
loss in sexual ability, desire, drive, or performance
medium to heavy, irregular vaginal bleeding between regular monthly periods, which may require the use of a pad or a tampon
stopping of menstrual bleeding
swelling of the breasts or unusual milk production
Incidence not known (both)
Belching
blindness
changes in vision
decreased vision
difficulty having a bowel movement
disturbed color perception
double vision
drowsiness
feeling of constant movement of self or surroundings
fullness or swelling of the breasts
halos around lights
heartburn
increased in sexual ability, desire, drive, or performance
increased interest in sexual intercourse
increased sensitivity of the skin to sunlight
indigestion
loss of hair
night blindness
overbright appearance of lights
pain or tenderness of the breasts
painful or prolonged erection of the penis
redness or other discoloration of the skin
sensation of spinning
severe sunburn
stomach discomfort or upset
tunnel vision
weight loss
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.
 Haldol Decanoate side effects (more detail)
