- Pancuronium
- Pantoprazole
- Pantothenic Acid
- Para-Aminosalicylic Acid
- Paramethadione
- Paregoric
- Pargyline
- Parnaparin
- Paromomycin
- Paroxetine
- Passion Flower
- Pemoline
- Penbutolol
- Penicillamine
- Penicillin G
- Penicillin G, Benzathine
- Penicillin G, Procaine
- Penicillin V
- Pentaerythritol Tetranitrate
- Pentamidine
- Pentazocine
- Pentobarbital
- Pentoxifylline
- Perindopril
- Permethrin
- Perphenazine
- Phenacetin
- Phenazocine
- Phenazopyridine
- Phencyclidine
- Phendimetrazine
- Phenelzine
- Phenindione
- Pheniramine
- Phenobarbital
- Phenolphthalein
- Phenoxybenzamine
- Phenprocoumon
- Phensuximide
- Phentermine
- Phentolamine
- Phenylbutazone
- Phenylephrine
- Phenylpropanolamine
- Phenyltoloxamine
- Phenytoin
- Physostigmine
- Phytonadione
- Pilocarpine
- Pindolol
- Pioglitazone
- Piperacetazine
- Piperacillin
- Piperazine
- Piperidolate
- Piroxicam
- Plicamycin
- Podofilox
- Podophyllum
- Polymyxin B
- Polythiazide
- Potassium Chloride
- Potassium Citrate
- Potassium Gluconate
- Potassium Iodide
- Povidone-Iodine
- Pravastatin
- Praziquantel
- Prazosin
- Prednisolone
- Prednisone
- Primaquine
- Primidone
- Probenecid
- Probucol
- Procainamide
- Procarbazine
- Prochlorperazine
- Procyclidine
- Proguanil
- Promazine
- Promethazine
- Propafenone
- Propantheline
- Propofol
- Propoxyphene
- Propranolol
- Propylthiouracil
- Protamine
- Protirelin
- Protriptyline
- Pseudoephedrine
- Pyrantel Pamoate
- Pyrazinamide
- Pyrethrins with Piperonyl Butoxide
- Pyridostigmine
- Pyridoxine
- Pyrilamine
- Pyrimethamine
- Pyrvinium Pamoate
