anchor.diff:  1919,"Pentamidine Isetionate Infusion"
   1920,"Pentamidine Nebuliser Solution"
   1921,"Pentastarch 6% Infusion"
  -1922,"Pentazocine Injection [CD]"
  -1923,"Pentazocine Tablet [CD]"
  +1922,"Pentazocine Injection"
  +1923,"Pentazocine Tablet"
   1924,"Pentosan Polysulphate Sodium Capsule"
   1925,"Pentostatin Injection"
   1926,"Pentoxifylline Injection"
  
positive.code: 1853,"Oxybutynin Patch 36mg (releasing 3.9mg over 24 hours)"
  1854,"Oxybutynin Tablet MR"
  1855,"Oxycel Dressing"
  1856,"Oxycodone (oxyCONTIN) Modified Release Tablet 10mg [CD]"
  1857,"Oxycodone (oxyCONTIN) Modified Release Tablet 20mg [CD]"
  1858,"Oxycodone (oxyCONTIN) Modified Release Tablet 40mg [CD]"
  1859,"Oxycodone (oxyCONTIN) Modified Release Tablet 5mg [CD]"
  1860,"Oxycodone (oxyNORM) Immediate Release Capsule 10mg [CD]"
  1861,"Oxycodone (oxyNORM) Immediate Release Capsule 20mg [CD]"
  1862,"Oxycodone (oxyNORM) Oral Solution 5mg in 5ml [CD]"
  1863,"Oxycodone Infusion [CD]"
  1864,"Oxycodone Injection (1ml Ampoule) 10mg in 1ml [CD]"
  1865,"Oxycodone Injection (2ml Ampoule) 20mg in 2ml [CD]"
  1866,"Oxymetholone Tablet"
  1867,"Oxytetracycline Tablet"
  1868,"Oxytocin Injection"
  
negative.code: 2401,"Talc Sterlised BP"
  2402,"Tamoxifen Tablet"
  2403,"Tamsulosin Capsule MR"
  2404,"Tapentadol Prolonged Release Tablet"
  2405,"Tar Pomade (Hospital Formula)"
  2406,"Tarcortin Cream"
  2407,"Tazarotene 0.05% Gel"
  