"Drug-seeking" behavior is very common in addicts and drug abusers. Drug-seeking tactics include emergency calls or visits near the end of office hours, refusal to undergo appropriate examination, testing or referral, repeated "loss" of prescriptions, tampering with prescriptions and reluctance to provide prior medical records or contact information for other treating physician(s). "Doctor Shopping" to obtain additional prescriptions is common among drug abusers and people suffering from untreated addiction.
Very common (10% or more): Headache
Common (1% to 10%): Dizziness, insomnia, somnolence, tremor, paresthesia, ataxia, nervousness, aphasia
Uncommon (% to 1%): Seizure, bad taste, cerebrovascular accident , intracranial hemorrhage , transient ischemic attack , neuralgia , muscle spasm, dysphoria, gait abnormality, hypertonia, hypokinesia, neurodermatitis, numbness (localized), dysarthria, dysphasia, nystagmus, pacing
Rare (less than %): Extrapyramidal symptoms
Very rare (less than %): Neuroleptic malignant syndrome [ Ref ]