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Tacrolimus is an immunosuppressive drug frequently used in solid organ transplant recipients. This drug has well-documented neuropsychiatric side effects in the literature, although emergence of psychotic symptoms is rare, being only described in a very few case reports. We present a case of a renal transplant recipient with no prior psychiatric history, who developed a severe psychosis secondary to supratherapeutic tacrolimus’ blood concentrations. This case highlights the importance of clinical awareness to rare but severe neuropsychiatric effects due to tacrolimus use.

BACKGROUND: Increasing consumption of psychoactive substances is a major social concern worldwide. OBJECTIVES: To investigate the prevalence of psychoactive substances consumption in the Portuguese, lifetime and recently, the main reasons for the consumption and associated factors. METHODS: This cross-sectional study was based on the ASSIST applied to a sample of 385 Portuguese obtained for convenience. It was used descriptive statistics, the qui-square, Mann-Whitney U and Kruskal-Wallis tests, with a significance level of 5%. RESULTS: Alcohol was the most consumed throughout life (86%), followed by xanthines (79%) and tobacco (60%). In the last 3 months, xanthines (49%) were the most consumed daily, followed by tobacco (22%) and alcohol (9%). Socializing was the main reason for consumption of alcohol (67%), tobacco (36%) and cannabis (34%). Anxiolytics have been used to sleep (50%) and xanthines to increase cognitive capacity (35%). Tobacco (p = 0.016), alcohol (p = 0.03) and illicit substances (p <  0.001) were more consumed by men and anxiolytics by women (p = 0.027). Alcohol (p = 0.008), cannabis (p = 0.027), and xanthines (p = 0.009) were mostly consumed by young adults. CONCLUSIONS: The results reveal sporadic and recreational use of illicit substances, and regular use of alcohol, tobacco and xanthines, mostly by young adults and men, and anxiolytics by women. Socializing was the main reason for psychoactive substances consumption.

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Cannabinoid hyperemesis syndrome (CHS) is characterized by episodic bursts of nausea, vomiting and abdominal pain, affecting chronic cannabis users. The clinical picture mimics an acute abdomen, usually leading to multiple assessments in the emergency department. Several complementary diagnostic examinations are performed with non-specific results, making differential diagnosis puzzling. We present a case of a 42-year-old man, who has been admitted multiple times to the emergency department in the last 3 months for abdominal pain, nausea and vomiting, without triggering factors and improving only with hot water baths. He was evaluated by different specialties, the various complementary diagnostic tests performed showed no significant results, and no definitive diagnosis was obtained. Treatment resulted only in a partial and transient resolution of symptoms. A more detailed medical history revealed cannabis use for more than 5 years, with a recent increase in the amount consumed. After psychoeducation, explaining the risks associated with consumption and its relationship with the clinical symptoms, which resulted in complete suspension of cannabis, there have been no new symptomatic episodes since then. We present an illustrative case of a poorly reported clinical entity despite having a probable significant prevalence, raising awareness in order that clinicians identify and properly manage these cases.

Huntington's disease (HD) is an inherited, progressive, and neurodegenerative neuropsychiatric disorder caused by the expansion of cytosine-adenine-guanine (CAG) trinucleotide in Interested Transcript (IT) 15 gene on chromosome 4. This pathology typically presents in individuals aged between 30 and 50 years and the age of onset is inversely correlated with the length of the CAG repeat expansion. It is characterized by chorea, cognitive deficits, and psychiatric symptoms. Usually the psychiatric disorders precede motor and cognitive impairment, Major Depressive Disorder and anxiety disorders being the most common presentations. We present a clinical case of a 65-year-old woman admitted to our Psychiatric Acute Unit. During the 6 years preceding the admission, the patient had clinical assessments made several times by different specialties that focused only on isolated symptoms, disregarding the syndrome as a whole. In the course of her last admission, the patient was referred to our Neuropsychiatric Team, which made the provisional diagnosis of late-onset Huntington's disease, later confirmed by genetic testing. This clinical vignette highlights the importance of a multidisciplinary approach to atypical clinical presentations and raises awareness for the relevance of investigating carefully motor symptoms in psychiatric patients.

IntroductionPsychiatric disorders are frequent among patients with epilepsy. The association between epilepsy and mood disorders is recognized since the classical antiquity. Recent studies demonstrated that the prevalence of bipolar symptoms in epilepsy patients is more significant than previously expected. In the first half of the twentieth century, Kraeplin and Bleuler were the first to describe a pleomorphic pattern of symptoms claimed to be typical of patients with epilepsy and recently Blumer coined the term interictal dysphoric disorder to identify this condition. Although for some authors, the existence of this condition as a diagnostic entity is still doubtful, for others, it represents a phenotypic copy of bipolar disorder.ObjectivesIn this work, we start from the phenomenological similarities between the interictal dysphoric disorder and the bipolar disorder, to explore the neurobiological underpinnings that support a possible link between epilepsy and bipolar disorder.MethodsResearch of articles published in PubMed and other databases.ResultsInterictal dysphoric patients have features that resemble the more unstable forms of bipolar II disorder and benefit from the same therapy used in bipolar depression. Epilepsy and bipolar disorder share features like episodic course, the kindling phenomenon as possible pathogenic mechanisms and the response to antiepileptic drugs. The study of possible common biological processes like neurogenesis/neuroplasticity, inflammation, brain-derived-neurotrophic-factor, hypothalamus pituitary adrenal axis, provided promising but not consensual results.ConclusionsFurther efforts to understand the link between epilepsy and bipolar disorder could provide the insight needed to find common therapeutic targets and improve the treatment of both illnesses.Disclosure of interestThe authors have not supplied their declaration of competing interest.

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