\begin{tikzpicture}[
line width=0.6pt,
font=\large,
% セル内のテキスト配置用スタイル
cell/.style={anchor=center}
]
% --- 表の枠組み(外枠と区切り線) ---
% 横線
\draw [very thick] (0, 0) -- (14.5, 0); % 上辺
\draw (0, -1.2) -- (14.5, -1.2); % 中央区切り
\draw [very thick] (0, -2.4) -- (14.5, -2.4); % 下辺
% 縦線
%\draw (0, 0) -- (0, -2.4); % 左端
\draw [very thick] (6.5, 0) -- (6.5, -2.4); % ヘッダー後
\draw (8.1, 0) -- (8.1, -2.4); % 1h後
\draw (9.7, 0) -- (9.7, -2.4); % 2h後
\draw (11.3, 0) -- (11.3, -2.4); % 4h後
\draw (12.9, 0) -- (12.9, -2.4); % 6h後
%\draw (14.5, 0) -- (14.5, -2.4); % 10h後(右端)
% --- ヘッダー(左列) ---
\node at (3.25, -0.6) {急速静脈内投与後の時間/h};
\node at (3.25, -1.8) {血漿中薬物濃度/$\upmu\rm g\,mL^{-1}$};
% --- データ行1(時間) ---
\node at (7.3, -0.6) {1};
\node at (8.9, -0.6) {2};
\node at (10.5, -0.6) {4};
\node at (12.1, -0.6) {6};
\node at (13.7, -0.6) {10};
% --- データ行2(濃度) ---
\node at (7.3, -1.8) {14.2};
\node at (8.9, -1.8) {10.0};
\node at (10.5, -1.8) {5.0};
\node at (12.1, -1.8) {5.0};
\node at (13.7, -1.8) {5.0};
% --- 注釈(矢印とテキスト) ---
% 4hの列(中心座標 10.5)の下に配置
\draw[thick, < -] (10.5, -2.5) -- (10.5, -3.0);
\node[below] at (10.5, -3.0) {定速静脈内投与の開始};
\end{tikzpicture}