LSD = no problem in combination, but you may feel diminished effects or even nothing (probably something at your dose)
DXM = wait 2 at least weeks if taking regularly, a single dose, probably OK in a few days but be careful
But as in all cases remember you are prescribed these drugs for a reason and that issues like depression and anxiety (most common SSRI indications) can come out quite nastily when tripping on either drug; LSD being particularly unpredictable, anything from a full on horrible terrified death trip to a feeling of euphoria followed by a terrible crash to a calm tranquil feeling that leaves you happy for days, any of these can happen and there's little you can do to predict or effect it,especially if you're combining taking these drugs with skipping your psych meds, which isn't a very good idea.)
This post or any of my communications do not constitute professional advice nor do they establish a professional relationship of any kind; I make no claim to any specific professional credentials; in person consultation is essential for any medical, psychological, substance-related or harm reduction decisions. While peer support an advice can be helpful, any content posted online, regardless of it's source, cannot, by it's very nature, substitute for an in-person relationship with a clinician who has had the opportunity to take your history in the larger context and provide professional advice with all these factors, and others, taken into account.
