Combinations - Do antihistamines affect LSD?

[w00tmastah]

SWIM recently bought two three hits of LSD. The acid was in a clear gelatin capsule. A white powder in the amount that would greatly exceed that of a standard LSD hit was visible in the powder. SWIM's dealer assured him that it was legit. SWIM orally ingests one hit of acid. Approximately three hours later after feeling nothing, SWIM ingested 2nd pill. It should be observed at this point that SWIM was smoking a great deal of marijuana and any effects from LSD might have gone unnoticed. Two hours later SWIM ingested the third and final capsule after still failing to observe the effects of LSD. About 45 minutes after this SWIM began noticing distorted visuals and an intense feeling of physical pleasure. SWIM also experienced a slight headache and strong stomach cramps. The high lasts for about 3-4 hours and then subsides. SWIM was wondering why after three hits the effect took so long, and why it was so mild. It is possible that the first or even both the first hits were bunk. The question I have and the purpose of this post is this: Do antihistamines have an affect on LSD? I am currently taking an anti-itch antihistamine: hydroxyzine, which is to help physical relief of dermatitis.