Manually specify width of underbracetext?

Question

I would like to increase the width of an \underbracetext command. Currently I have:

\begin{table}[H]
\begin{adjustwidth}{-0.15in}{-0in}
\footnotesize
\centering
\begin{tabular}{lllllllll}
\textbf{Lamotrigine} & \textbf{250mg}       & \textbf{in} & \textbf{the}        & \textbf{morning}     & \textbf{,}     & \textbf{200mg}      & \textbf{at}        & \textbf{night} \\
\multicolumn{1}{c}{\underbracetext{\textbf{Drug}}} & \multicolumn{4}{c}{\underbracetext{\textbf{Direction 1}}} & & \multicolumn{3}{c}{\underbracetext{\textbf{Direction 2}}}
 \\
\end{tabular}
\end{adjustwidth}
\end{table}

that produces:

But I would like to increase the length of the second and third braces so that the second one spans from 250 to morning, and the third spans 200mg to night.

i.e. when I say spans from, I mean start the underbrace where the word starts, not from the middle.

Answer 1

Do you need to put it like this in the table? If not, you may just do

\documentclass{article} 
\usepackage{amsmath}
\begin{document} 
\[
\underbrace{\textbf{Lamotrigine}}_{\displaystyle\text{\textbf{Drug}}}~
\underbrace{\text{\textbf{250mg in the morning}}}_{\displaystyle\textbf{\textbf{Direction
1}}},~\underbrace{\text{\textbf{200mg at night}}}_{\displaystyle\textbf{Direction 2}}
\]
\end{document}

There are several other possibilities, e.g. TikZ.