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
- Sleepiness
- Dizziness
- Poor balance or coordination
Less Common Side Effects
- Nausea
- Vomiting
- Constipation
- Headache
- Slowed heart rate
- Fainting
- Confusion
Phenobarbital serious side effects
Contact your healthcare provider immediately if you experience any of the following.
- Dangerously slow breathing: shortness of breath, bluish-colored lips, fingers, or toes
- Serious allergic and skin reactions: sore throat, fever, fatigue, rash, hives, painful blisters, skin reddening, skin peeling
Source: DailyMed
The following Phenobarbital 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 immediately if any of the following side effects occur:
Rare
Confusion (especially in the elderly)
dizziness, lightheadedness that continues, or fainting
skin rash or hives
Incidence not known
difficulty with swallowing
fast irregular, pounding, or racing heartbeat or pulse
hives or welts
hoarseness
irritation
itching skin
joint pain, stiffness, or swelling
puffiness or swelling of the eyelids or around the eyes, face, lips, or tongue
redness of the skin
shortness of breath
skin rash
tightness in the chest
trouble with breathing
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 or rare
Bloated feeling
blurred vision
difficult urination
difficulty with swallowing
drowsiness
false sense of well-being
headache
increased sensitivity of eyes to light
loss of memory
nausea or vomiting
redness or other signs of irritation at the place of injection
trouble with sleeping
unusual tiredness or weakness
Incidence not known
Decreased interest in sexual intercourse
inability to have or keep an erection
loss in sexual ability, desire, drive, or performance
loss of taste
For patients using scopolamine:
After you stop using scopolamine, your body may need time to adjust. The length of time this takes depends on the amount of scopolamine you were using and how long you used it. During this period of time check with your doctor if you notice any of the following side effects:
irritability
nightmares
pupil of one eye is larger (patch only)
sensitivity of eyes to light (patch only)
trouble in sleeping
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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