Hi. I Have Regularly/maintenance Prescribed (daily, To Be Taken For

Hi. I have regularly/maintenance prescribed (daily, to be taken for ever!) Acyclovir, 200mg caplets (blue/white oblong) and am running low on them, but also have 400mg pills (white/round) available. Can these be cut in half? Would 1/2 of a 400mg pill be equivalent to one 200mg caplet. I know the caplet shell has a specific purpose, but I'm sure it is not an extended release capsule. And if it is, could I then take the second half of the400mg pill later in the day, since my regular 200mg caplets are to be taken only once a day, taking the two halves spread out during the day may help mimic the retarding effect of the caplet. Albeit I'd be increasing the daily dosage, but I would be avoiding doubling it all at once, since the 200mg caplets tend to affect my stomach once in a rare while. The reason I want to do this is that I'm in between insurance plans and not able to refill my 200mg caplets before they run out. Thank you.