Edit in JSFiddle

var dataPoints = [];
for (var x = 0; x <= 12; x += 0.25) {
    dataPoints.push({
        x: x,
        y: 1000 * (0.5 / (50 * 0.6)) * (Math.exp(-((6) / (50 * 0.6) * x)))
    });
}

console.dir(dataPoints);

var chart1 = new CanvasJS.Chart("chartContainer1", {
    title: {
        text: "Single Intravenous 500mg Dose"
    },
    zoomEnabled: true,
    panEnabled: true,

    axisX: {
        title: "Concentration (ug/ml)",
    },
    axisY: {
        title: "Plasma Concentration",

    },
    data: [{
        showInLegend: false,
        type: "line",
        dataPoints: dataPoints
    }]
});


chart1.render();

<div id="chartContainer1" style="height: 500px; width: 50%;"></div>
<form>
    <p>BW(Kg):
        <input type="number" id="bw">
    </p>
    <p>Vd/BW (L/Kg) :
        <input type="number" id="vd_bw" value="0.6">
    </p>
    <p>Clearance(L/Hr) :
        <input type="number" id="clearance" value="50">
    </p>
    <p>Dose(g) :
        <input type="number" id="dose" value="0.5">
    </p>
</form>