Phosphorus.
Picrotoxine: in periodical headache.
Podophyllum: when constipation.
Potassium Cyanide: as local application.
Pulsatilla.
Quinine.
Salicylate of Sodium: three grn. dose every half hour exceedingly useful.
Sanguinaria: in gastric derangement.
Sitz-bath.
Skull-cap: as prophylactic.