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Sedation and hypnosis are the principal side effects of phenobarbital. Central nervous system effects like dizziness, nystagmus (involuntary eye movement) and ataxia (unsteady and clumsy motion of the limbs and torso) are also common. In elderly patients, it may cause excitement and confusion while in children, it may result in paradoxical hyperactivity.1


1. http://en.wikipedia.org/wiki/Phenobarbital

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16y ago
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8y ago

The most common side effects are drowsiness, light-headedness, dizziness, and unsteadiness. Less common are muscle or joint pain, chest pain, breathing difficulties, rashes and other skin problems. Interestingly, after you stop taking a barbiturate, side effects can continue and new ones can develop; these can include anxiety, vision problems, hallucinations, and seizures.

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13y ago

Common side effects include drowsiness, headache , dizziness, depression , stomachache, and vomiting. More severe side effects include nightmares, constipation, and pain in muscles and joints.

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10y ago

Literature reports just a few side effects such as increased sleepiness. However some reports mention withdrawal symptoms, resulting in nervousness, insomnia and shakyness. Phenibut must not be mixed with alcohol, sedatives or prescription medication.

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11y ago

it fails to prod

uce the

desired effect

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12y ago

The most common side effects are dizziness, lightheadedness, drowsiness, and clumsiness or unsteadiness.

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6y ago

Phenytoin is associated with gum hyperplasia. Whether gum hyperplasia occurs and its severity is related to the dose of phenytoin as well as its serum concentration.

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Q: What are the side effects of phenytoin?
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