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Adverse effects

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Does St John’s Wort interact with combined and progestogen only hormonal contraception?

1 June 2020This updated Medicines Q&A evaluates the available evidence regarding an interaction between St John’s Wort and combined and progestogen only hormonal contraceptives. Summary The interaction…

What is serotonin syndrome and which medicines cause it?

22 May 2020This Medicines Q&A outlines the causes and symptoms of serotonin syndrome and provides examples of medicines with the potential to cause serotonin syndrome.  

Does St John's Wort interact with Emergency Hormonal Contraception?

13 May 2020This updated Medicines Q&A evaluates the available evidence regarding an interaction between St John’s Wort and emergency hormonal contraception. Summary Levonorgestrel is a progestogen commonly…

Cannabidiol oil - potential adverse effects

27 February 2020Self-administration of over-the-counter bought CBD is increasingly popular and doctors and pharmacists should be aware of its potential adverse effects. The Food Standards Agency (FSA)…

Chondroitin - what are its drug interactions?

23 January 2020There are two published case reports of increased INR in patients receiving warfarin who self-medicated with glucosamine-chondroitin supplements. INR was increased in a further three…