Codice PHP:
header("Content-type: application/pdf");

require(
'fpdf.php'); 

$pdf=new FPDF();
$pdf->AddPage(); 
$pdf->SetFont('Times','B',12); 
$pdf->MultiCell(0,5,"Campo 1"); 
$pdf->SetFont('Times','',12); 
$pdf->MultiCell(0,5,"dato 1");
$pdf->SetFont('Times','B',12); 
$pdf->MultiCell(0,5,"Campo 2"); 
$pdf->SetFont('Times','',12); 
$pdf->MultiCell(0,5,"dato 2");
$pdf->Output(); 
Comre faccio:

Campo 1 dato 1
Campo 2 dato 2