Stable forms of capsaicin palmitate for the treatment of pain

A method of treating a disease in a subject in need thereof, the method comprising administering to the subject:

• an effective amount of a solid form of capsaicin palmitate, comprising a compound of formula (I):
• or a solvate, hydrate or isotope thereof, wherein the solid form is characterized by an X-ray diffraction pattern comprising at least one peak position, in degrees 2θ (±0.2°), selected from the group consisting of 5.48, 13.74, 19.22 and 20.06;
• and
• an effective amount of at least one additional therapeutic agent selected from the group consisting of a chemotherapeutic agent, a non-steroidal anti-inflammatory agent, a steroidal agent, an anesthetic, or any combination thereof.