Clonazepam is the least effective benzodiazepine I have ever taken in my life.
Lorazepam (Active ingredient in Ativan) is already well-absorbed via the oral route, but I take most benzodiazepines via the sublingual route, with two exceptions: temazepam and diazepam. Both of these have near 100% oral BA and are extremely fat soluble so even though I'm sure they'd work well via the SL route, in my experience, onset is not significantly faster via the SL route, hence why I just swallow them, knowing that I'm getting my complete dose.
Why are your options limited to clonazepam or lorazepam? I've found neither of the two to be helpful to me in any way.
It's really disappointing because on paper, clonazepam and lorazepam were the two benzodiazepines that I would expect to be most effective, what with clonazepam's potency and lorazepam's having affinity for each of the six intrinsic BZD receptors and their properties, like it's supposed to possess great antiemetic/antinausea, anxiolytic/anti-anxiety, muscle relaxer, anticonvulsant (most importantly), hypnotic, and amnesic properties, but I found it to be rather ineffective overall for any of these when they were needed.
Clonazepam is indistinguishable from a placebo in my experience, so definitely look into other options if you are not getting what you need out of your current lorazepam / clonazepam instead of trying to force effects that these drugs may not even possess for you by switching the ROA.
I'd definitely have to accept the RX for sublingual lorazepam over clonazepam if I were limited to these options...