Abbie's two-line poem treats silence like a substance that can help you or hurt you, depending on how much you take. The opening warning, "be cautious in your dose taking," sounds almost like a label on a medicine bottle. A little quiet can be calming, a way to rest or think. The trouble, the speaker suggests, is that silence is easy to slip into and hard to leave.
The second line carries the real worry. Some people get "addict," as the poem puts it, and lose the "urge to speak" altogether. What's frightening here isn't that they choose to stay quiet, but that they stop wanting to say anything at all. The word "again" hints that they once felt that urge and can no longer reach it.
The mood is cautionary and a little sad. The speaker sounds calm and almost clinical, yet there is real concern underneath, maybe even a sense that the speaker knows this danger from the inside. That is an inference, but the quiet tone makes it feel personal.