Old thread, but interesting there's another case of a potential allergy.
I ended up having an anaphylactic response to some of their gear, and mistakenly believed it to be their Primo - turns out it was the Test 400. It's certainly not the hormone itself, but there may have been some deficiencies in their brewing process toward the end (slight sarcasm).
The reaction caused my windpipe to close over a bit making it very difficult to breathe for days on end. Through some dumb luck and research I found an effective treatment which remedied that symptom. Whether it was the benzyl benzoate I don't know, but the treatment certainly worked for an allergic reaction.
Treatment options for those without (and who don't need) an Epipen would be Promethazine (aka Phenergan the antihistamine) and Prednisolone tabs if you have them handy. The promethazine is the most important one here as it will suppress the immune response/histamine production and abate the symptoms. Other H1 agonists didn't work as well as Phenergan. You'll only need 1 tab, it's possible to OD on anti-histamines so don't take a bunch of them.
I've linked a journal article discussing a patient who experienced anaphylaxis caused by Reandron injections (Test U) - in a clinical setting they used intravenous promethazine and hydrocortisone to treat his symptoms very rapidly and successfully. In this instance he was allergic to benzyl benzoate (has many uses - a solvent, preservative, stabiliser, mozzie repellent etc.) which constituted part of the excipient ingredients (e.g. not the hormone itself). It's an underestimated area of medicine - allergies caused by the more benign ingredients, but isn't unheard of, there's a lot of other info online regarding benzyl benzoate allergies.
The issue described by the OP might not have been caused by benzyl benzoate as
@Markus mentioned, carrier oil can also cause reactions, an antihistamine can sometimes knock out some of these reactions, depends on what caused it though. But for the sake of an antihistamine tablet and waiting 30 minutes, it might be all you need. Don't be like me and insist that you're wasting the ER's time by going there because you can't breathe much - if it gets to that point pls take my advice and just go. Anaphylaxis is not something to fuck about with.
