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Mycophenolate mofetil and its active metabolite mycophenolic acid are associated with a high rate of serious birth defects and increased risk of spontaneous abortion.
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There have been very rare reports of posterior reversible encephalopathy syndrome (PRES) and reversible cerebral vasoconstriction syndrome (RCVS) with pseudoephedrine.
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Abacavir should be used in line with current treatment guidelines and with caution in patients with high cardiovascular risk factors.
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A patient alert card is being introduced for men taking finasteride to help raise awareness of the risk of psychiatric side effects and sexual dysfunction, including the potential for sexual dysfunction to persist after trea…
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Maternal administration of magnesium sulfate for longer than 5–7 days in pregnancy has been associated with skeletal adverse effects and hypocalcaemia and hypermagnesemia in neonates. If use of magnesium sulfate in pregnancy…
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A summary of recent letters, medicine recalls and notifications sent to healthcare professionals
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The Commission on Human Medicines (CHM) has endorsed changes to the risk minimisation measures for isotretinoin, following a review of the impact of the measures implemented in 2023.…
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The product information for all Glucagon-Like Peptide-1 (GLP-1) receptor agonists and dual GLP-1/glucose-dependent insulinotropic polypeptide (GIP) receptor agonists has been further updated to highlight the potential risk o…
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Recent information relating to COVID-19 vaccines and medicines that has been published since the December 2021 issue of Drug Safety Update, up to 13 January 2022.
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We have initiated a new safety review into topiramate as a result of an observational study reporting an increased risk of neurodevelopmental disabilities in children whose mothers took topiramate during pregnancy.
Topir…
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In light of the most recent evidence, the previous advice on the concomitant use of clopidogrel with proton pump inhibitors has now been modified. Use of either omeprazole or esomeprazole with clopidogrel should be discourag…
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The Commission on Human Medicines (CHM) has endorsed changes to isotretinoin prescribing guidance. In addition, CHM is seeking further information from dermatology services who prescribe isotretinoin to inform any future changes to current risk minimisation measures.
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Advice for healthcare professionals regarding the withdrawal of pholcodine-containing medicines from the market.
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Calcium salts (either calcium chloride or calcium gluconate) are used to stabilise the myocardium and prevent cardiac arrest in patients experiencing severe hyperkalaemia. However, the two salts are not equivalent in terms o…
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Revisions have been made to the information for healthcare professionals and information for UK vaccine recipients for the COVID-19 Vaccine Moderna and Pfizer/BioNTech COVID-19 vaccine following a thorough review of extremel…
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A summary of recent letters and notifications sent to healthcare professionals about medicines, and a patient safety alert on mexiletine hydrochloride.
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Important to inquire if patients are taking herbal medicines.
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Risk of serious skin-related adverse drug reactions, including Stevens-Johnson syndrome, occurring with carbamazepine may be increased in the presence of the HLA-A*3101 allele in patients of European descent or Japanese orig…
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A summary of letters and drug alerts recently sent to healthcare professionals.
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The seventh annual #MedSafetyWeek social media campaign will take place 7 to 13 November 2022 and this year’s focus is the importance of reporting suspected adverse reactions to medicines and vaccines. We are also encouragin…
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A summary of recent letters, medicine recalls and notifications sent to healthcare professionals
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We remind healthcare professionals that isotretinoin should only be used for severe forms of acne resistant to adequate courses of standard therapy with systemic antibacterials and topical therapy. Prescription of isotretino…
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The annual #MedSafetyWeek campaign takes place from 3 to 9 November 2025. This year’s campaign theme is ‘we can all help make medicines safer.’
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Healthcare professionals prescribing fluoroquinolone antibiotics (ciprofloxacin, delafloxacin, levofloxacin, moxifloxacin, ofloxacin) are reminded to be alert to the risk of disabling and potentially long-lasting or irrevers…
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We have recently received 2 reports of fatal adverse reactions to the yellow fever vaccine (Stamaril). Due to an increased risk of life-threatening reactions, the vaccine must not be given to anyone with a medical history of…
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Systematic reviews and meta-analyses of randomised controlled trials have highlighted a dose-dependent increased risk of atrial fibrillation in patients with established cardiovascular diseases or cardiovascular risk factors…
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Topical oral salicylate gels are no longer indicated for people younger than 16 years for pain associated with infant teething, orthodontic devices, cold sores, or mouth ulcers.
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Idiopathic intracranial hypertension (IIH) has been very rarely reported in patients treated with mesalazine. Following a recent review, warnings for IIH are being added to the product information for all mesalazine products…
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Cases of interstitial lung disease and pneumonitis have been reported in patients receiving CDK4/6 inhibitors indicated for some breast cancers. Ensure that patients taking these medicines are aware of the need to seek advic…
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New recommendations following a review of the risks of dependence and addiction associated with prolonged use of opioid medicines (opioids) for non-cancer pain. Before prescribing opioids, discuss with the patient the risks …
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With the exception of medicines containing zidovudine, stavudine, or didanosine, product information will no longer include warnings on fat redistribution or lactic acidosis.
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Prescribers and dispensers should use caution if switching patients between different long-acting formulations of methylphenidate (Concerta XL, Medikinet XL, Equasym XL, Ritalin LA, and generics) as different instructions fo…
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Amiodarone has been associated with serious and potentially life-threatening side effects, particularly of the lung, liver, and thyroid gland. We remind healthcare professionals that patients should be supervised and reviewe…
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A standardised pre-vaccination checklist has been introduced to ensure the yellow fever vaccine is indicated for the intended travel destination and to enable vaccinators to identify existing contraindications or precautions…
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Healthcare professionals prescribing nitrofurantoin should be alert to the risks of pulmonary and hepatic adverse drug reactions and advise patients to be vigilant for the signs and symptoms in need of further investigation.
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We have introduced pack size restrictions, revised recommended ages for use, and new safety warnings for over-the-counter stimulant laxatives (orally and rectally administered) following a national safety review. Advise pati…
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A summary of recent letters and notifications sent to healthcare professionals about medicines and medical devices, and information about the publication of two recent Device Safety Information pages. The article also includ…
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Evidence suggests an increased risk of aminoglycoside-associated ototoxicity in patients with mitochondrial mutations, including cases in which the patient’s aminoglycoside serum levels were within the recommended range. The…
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Healthcare professionals should be aware of alerts and letters issued about adrenaline auto-injectors in September and October 2019. This article provides a summary of recent advice issued to healthcare professionals, includ…
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There is a risk of harmful drug interactions with the ritonavir component of the COVID-19 treatment Paxlovid▼ due to its inhibition of the enzyme CYP3A, which metabolises many commonly used drugs. Prescribers should obtain a…
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If a patient reports persistent symptoms when switching between different levothyroxine tablet formulations, consider consistently prescribing a specific product known to be well tolerated by the patient. If symptoms or poor…
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How MHRA monitors the impact of regulatory action taken.
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Psychological side effects such as anxiety, low mood, sleep disturbance, poor concentration, and forgetfulness have been infrequently reported in people with cystic fibrosis treated with Kaftrio. Healthcare professionals sho…
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Non-arteritic anterior ischemic optic neuropathy (NAION), a condition that can cause sudden deterioration in vision, usually in one eye at a time, has been very rarely reported in association with semaglutide in the treatmen…
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We remind healthcare professionals that elderly patients are at an increased risk of adverse neurological and cardiac effects when being treated with haloperidol for delirium. The lowest possible dose of haloperidol should b…
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Updated safety and educational materials are now available to support the implementation of the regulatory measures announced in the November 2023 National Patient Safety Alert and the September 2024 Drug Safety Update. They…
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Globally, there has been a very small number of reports of new-onset or aggravation of pre-existing myasthenia gravis with atorvastatin, pravastatin, lovastatin, fluvastatin, simvastatin, rosuvastatin and pitavastatin (singl…
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Carefully consider the benefits and risks before prescribing systemic azithromycin or other systemic macrolide antibiotics (erythromycin or clarithromycin) to patients being treated with hydroxychloroquine or chloroquine. An…
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Healthcare professionals should be aware of the potential risk of pulmonary aspiration in patients using GLP-1 or dual GIP/GLP-1 receptor agonists who undergo surgery or procedures with general anaesthesia or deep sedation.
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We are providing an update on a retrospective observational study on the risk to children born to men who took valproate in the 3 months before conception and on the need for the re-analysis of the data from this study befor…