Which method of drug administration is preferred for a slow and steady dose of a medication?

The preferred method for delivering a slow and steady dose of a medication is through a topical patch. This method allows the medication to be absorbed through the skin gradually over an extended period, providing a controlled release into the bloodstream. This steady infusion helps maintain consistent therapeutic levels in the body without the peaks and troughs often associated with other methods of administration.

In contrast, intravenous injections deliver medication directly into the bloodstream, providing immediate effects but not allowing for extended or controlled release. Oral ingestion can lead to variable absorption rates and is subject to first-pass metabolism by the liver, which may result in fluctuating blood levels. Sublingual tablets can provide rapid absorption and quick onset of action, but they do not maintain a steady state over time as effectively as topical patches. Thus, the nature of the topical patch makes it particularly well-suited for situations where a constant level of medication is desired.