More than for any other infection, patients receiving ART require their doctor to have a clear understanding of the basic principles of pharmacology to ensure effective and appropriate prescribing. This is especially the case in four therapeutic areas. We recommend that potential adverse pharmacokinetic interactions between ARV drugs and other concomitant medications are checked before administration (with tools such as http://www.hiv-druginteractions.org) find more (GPP). Record in patient’s

notes of potential adverse pharmacokinetic interactions between ARV drugs and other concomitant medications. The importance of considering the potential for drug interactions in patients receiving ART cannot be overemphasized. DDIs may involve positive or negative interactions between ARV agents or between these and drugs used to treat other coexistent conditions. A detailed list is beyond the remit of these guidelines but clinically important interactions to consider when co-administering with ARV drugs

include interactions with the following drugs: methadone, oral contraceptives, anti-epileptics, antidepressants, lipid-lowering agents, acid-reducing agents, certain antimicrobials (e.g. clarithromycin, minocycline and fluconazole), some anti-arrhythmics, TB therapy, anticancer drugs, immunosuppressants, phosphodiesterase inhibitors and anti-HCV therapies. Most of these interactions can be managed safely (i.e. with/without dosage Regorafenib in vivo modification, together with enhanced clinical vigilance) but in some cases (e.g. rifampicin and PIs, proton pump inhibitors and ATV, and didanosine and HCV therapy)

the nature of the interaction is such that co-administration must be avoided. Importantly, patient education on the risks of drug interactions, including over-the-counter or recreational drugs, should be undertaken and patients should be encouraged to check with pharmacies or their healthcare professionals filipin before commencing any new drugs, including those prescribed in primary care. Large surveys report that about one-in-three-to-four patients receiving ART is at risk of a clinically significant drug interaction [1-6]. This suggests that safe management of HIV drug interactions is only possible if medication recording is complete, and if physicians are aware of the possibility that an interaction might exist. Incomplete or inaccurate medication recording has resulted from patient self-medication, between hospital and community health services [7] and within hospital settings particularly when multiple teams are involved, or when medical records are fragmented (e.g. with separate HIV case sheets) [8]. More worryingly, one survey in the UK reported that even when medication recording is complete, physicians were only able to identify correctly one-third of clinically significant interactions involving HIV drugs [4].