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The dosage is based on your medical condition, age, and response to therapy. If you are using the oral solution, measure your dose with a special measuring spoon or device. Do not use a household spoon because it may not provide the correct dose. Take this medication regularly in order to get the most benefit from it. To help you remember, take it at the same times each day. Take this medication at least 1 hour before antacids containing magnesium, aluminum, or calcium. Allow at least hours between doses of benztropine and certain drugs for diarrhea adsorbent antidiarrheals such as kaolin, pectin, attapulgite.

Take this medication at least 2 hours after ketoconazole. Antacids and some drugs for diarrhea may prevent the full absorption of benztropine, and this product may prevent the complete absorption of ketoconazole when these products are taken together. If you are taking this medication for side effects from another medication, your doctor may instruct you to take it on a regular schedule or only as needed.

If you are taking this medication for Parkinson's disease, your doctor may change the dose of your other medications such as levodopa. Follow your doctor's instructions closely. When this medication is used for a long time, it may not work as well.

Talk with your doctor if this medication stops working well. Though it helps many people, this medication may sometimes cause addiction. Take this medication exactly as prescribed to lower the risk of addiction. Ask your doctor or pharmacist for more details. Do not increase your dose, use it more often, or use it for a longer time than prescribed.

Properly stop the medication when so directed. Some conditions may become worse when the drug is suddenly stopped. Your dose may need to be gradually decreased. It may take days before the benefit of this drug takes effect. Tell your doctor if your condition lasts or gets worse. Drowsiness, dizziness, constipation, flushing, nausea, nervousness, blurred vision, or dry mouth may occur as your body adjusts to the medication.

If any of these effects last or get worse, tell your doctor or pharmacist promptly. To minimize dizziness and lightheadedness, get up slowly when rising from a sitting or lying position. To relieve dry mouth, suck sugarless hard candy or ice chips, chew sugarless gum, drink water, or use a saliva substitute.

Remember that your doctor has prescribed this medication because he or she has judged that the benefit to you is greater than the risk of side effects. Many people using this medication do not have serious side effects. A very serious allergic reaction to this drug is rare. However, get medical help right away if you notice any symptoms of a serious allergic reaction, including:.

This is not a complete list of possible side effects. If you notice other effects not listed above, contact your doctor or pharmacist. Call your doctor for medical advice about side effects. In Canada - Call your doctor for medical advice about side effects. You may report side effects to Health Canada at Before taking benztropine, tell your doctor or pharmacist if you are allergic to it; or if you have any other allergies.

This product may contain inactive ingredients, which can cause allergic reactions or other problems. Talk to your pharmacist for more details. If you miss a dose of this medicine, take it as soon as possible. However, if it is almost time for your next dose, skip the missed dose and go back to your regular dosing schedule.

Do not double doses. Store the medicine in a closed container at room temperature, away from heat, moisture, and direct light. Keep from freezing. It is important that your doctor check your progress at regular visits to allow changes in your dose and to check for any unwanted effects.

Benztropine may cause dizziness, trouble in controlling movements, or trouble in thinking or seeing clearly. Make sure you know how you react to this medicine before you drive, use machines, or do other jobs that require you to be alert, well-coordinated, or able to think or see well. Do not stop taking this medicine without first checking with your doctor. Your doctor may want you to gradually reduce the amount you are using before stopping completely.

This medicine may make you sweat less, causing your body temperature to increase. Use extra care to avoid becoming overheated during exercise or hot weather while you are taking this medicine, since overheating may result in heat stroke.

This medicine may cause muscle weakness. If you have concerns about this, check with your doctor. If you develop any unusual or strange thoughts and behavior while receiving benztropine, be sure to discuss it with your doctor. Some changes that have occurred in people receiving this medicine are like those seen in people who drink too much alcohol. Other changes might be confusion, worsening of depression, visual hallucinations seeing things that are not there , suicidal thoughts, and unusual excitement, nervousness, or irritability.

This medicine will add to the effects of alcohol and other CNS depressants medicines that make you drowsy or less alert. Some examples of CNS depressants are antihistamines or medicine for hay fever, other allergies, or colds; sedatives, tranquilizers, or sleeping medicine; prescription pain medicine or narcotics; barbiturates; medicine for seizures; muscle relaxants; or anesthetics, including some dental anesthetics.

Check with your medical doctor or dentist before taking any of the above while you are taking this medicine. 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.

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:.

However, the side-effects produced by nasal spray administration, and the absence of appropriate smoking cues associated with nasal spray, may make it more difficult to replicate some of the subjective psychological effects of smoking with this form of nicotine administration.

The failure of smoking cigarettes or administration of nicotine nasal spray to produce increases in tardive dyskinesia contrasts with the results of Dalack and others Dalack et al. However most of our patients were being treated with atypical antipsychotic medications which have a very low propensity to produce tardive dyskinesia, whereas many of the patients in the earlier studies were on conventional antipsychotic medications.

Atypical antipsychotics may not produce the post-synaptic receptor dopaminergic supersensitivity which some models have postulated as underlying some of the pathophysiology of tardive dyskinesia. The increased release of dopamine produced by nicotine may therefore not have acted on a substrate of supersensitive dopamine receptors to result in the behavioral expression of increases in tardive dyskinesia symptoms.

In summary, our studies show an effect of acute administration of cigarettes on reducing negative symptoms in patients with schizophrenia, with a stronger effect for a cigarette with a higher nicotine content.

Administration of nicotine by nasal spray improved performance on a spatial rotation task in schizophrenics, and there was suggestive evidence that smoking high nicotine cigarettes also improved this function. Active nicotine nasal spray also tended to improve some measures of short term verbal memory. It is possible these effects of smoking or nicotine on ameliorating negative symptoms and cognitive deficits may help explain some of the reasons why patients with schizophrenia show such a high rate of cigarette dependence.

If these ameliorative effects showed short term tolerance, it would provide a rationale as to why repeated intermittent smoking may be needed to maintain these beneficial effects. Whether tolerance develops to these effects needs to be determined in future studies that compare the behavioral effects of acute vs.

Continued study in this area may contribute to the understanding of the neurobiology underlying of both schizophrenia and cigarette addiction, and has the potential of suggesting avenues for new treatments of some of the deficits of schizophrenia and nicotine dependence. Am J Psychiatry : — Biol Psychiatry 32 : — Andreasen N.

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Farishta Samimy, B. You can also search for this author in PubMed Google Scholar. Negative symptoms : N1-blunted affect, N2-poor rapport, N6-lack of spontaneity, N7-stereotyped thinking. General symptoms : G2-anxiety, G4-tension, G-6 depression, G8-uncooperativeness, G9-unusual thought content, Gpoor attention. Reprints and Permissions. Smith, R. Neuropsychopharmacol 27, — Download citation.

Received : 06 August Revised : 04 February Accepted : 26 February Published : 04 March Issue Date : 01 September Anyone you share the following link with will be able to read this content:. Sorry, a shareable link is not currently available for this article.

Provided by the Springer Nature SharedIt content-sharing initiative. Scientific Reports Psychopharmacology Current Addiction Reports Neuroscience Bulletin Advanced search. Skip to main content Thank you for visiting nature. Download PDF. Abstract Schizophrenic patients have among the highest rates of smoking of any group of patients. Main Schizophrenics have a higher rate of cigarette smoking than patients with other psychiatric diagnoses or patients without definite psychiatric diagnoses Dalack et al.

Nicotine Levels Nicotine levels and carbon monoxide levels recorded in the pre-drug administration assessments suggested that our subjects were generally abstinent during the preceding night and morning. Figure 1. Full size image. Figure 2. Figure 3. Cognitive Effects The stronger differential drug effects in the nasal spray as compared with the cigarette smoking sessions, suggest that nicotine itself may mediate some of the effects on improvement in spatial processing or memory and verbal recall.

Desensitization and Tolerance to Nicotine's Effects The lack of effects on some neurocognitive measures, and the less robust effects of smoking and nicotine nasal spray administration that we found on some others, may be due to rapid tolerance to some of nicotine's effects which may be related to rapid desensitization of nicotinic receptors.

Pulse and Nicotine Levels Our results showing that the denicotinized cigarettes produced small increases in nicotine levels, and produced a fairly similar increase in pulse as the high nicotine cigarette, suggests that the denicotinized cigarette is pharmacologically active, and is not a perfect placebo. Tardive Dyskinesia The failure of smoking cigarettes or administration of nicotine nasal spray to produce increases in tardive dyskinesia contrasts with the results of Dalack and others Dalack et al.

D View author publications. View author publications. Rights and permissions Reprints and Permissions. About this article Cite this article Smith, R. Copy to clipboard. Lei , Kenneth Hugdahl , Rune A. Kroken , Carina Rau , Jolien D. Sommer npj Schizophrenia Nicotine-induced activation of caudate and anterior cingulate cortex in response to errors in schizophrenia Lauren V. Moran , Luke E. Stoeckel , Kristina Wang , Carolyn E. Baker , Dost Ongur , Amy C. Janes , A.

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