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Interactions

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Managing specific interactions with smoking

31 October 2023When individuals taking certain medicines stop, start or re-start smoking, monitoring and dose changes may be needed.

Questions to ask when reviewing herbal medicines and interactions

28 March 2024Information should be gathered about the patient and herbal medicine to enable risk assessment and decision making on the interaction.

Understanding complementary medicines

28 March 2024Points to consider when advising on the use of complementary medicines.

Understanding direct oral anticoagulant (DOAC) interactions

5 January 2024It is important to understand the risks, mechanisms of interactions and actions to take when prescribing medicines with DOACs.

Understanding drug interactions

15 January 2024This article discusses different mechanisms of drug interactions. We link to other SPS articles to help support decision making.

Understanding enzyme or transporter-based drug interactions

22 May 2024Many interactions are due to inhibition or induction of metabolising enzymes or drug transporters. Enzyme, transporter, and drug half-lives dictate duration.

Using bisphosphonates with proton pump inhibitors (PPIs)

4 April 2023Although no interaction between bisphosphonates and PPIs is documented, the increased risk of fractures when given together should be reviewed and managed

Using clopidogrel with proton pump inhibitors (PPIs)

22 May 2023Avoid the combined use of clopidogrel with omeprazole or esomeprazole due to a significant interaction. Other PPIs are considered safe with clopidogrel.

Using contraception with enzyme-inducing medicines

13 February 2023Enzyme-inducing medicines reduce the effectiveness of certain contraceptives. Guidance on using contraception with these medicines is given.

Using folic acid and phenytoin safely

12 April 2024Folic acid interacts with phenytoin and can reduce phenytoin blood levels. Concomitant use is possible with careful management of the interaction.