OTC Voltaren (1% diclofenac) gel: Apply to no more than two body parts (such as the knee and ankle, or the hand and ankle) ...

Diclofenac sodium 1%; gel. Temporary relief of arthritis pain only in upper body areas (eg, hand, wrist, elbow) or lower body areas (eg, foot, ankle, knee). Use dosing card to apply gel.

Diclofenac sodium 3%; gel; contains benzyl alcohol. Use lowest effective dose for shortest duration. Apply to lesions twice daily for 60–90 days. Use 0.5g (pea size amount) on each 5cm×5cm ...

That's a problem, as wastewater treatment plants are unable to remove diclofenac from the sewage water, meaning residues can end up in nature where they pose a risk to animals and plants, Germany's ...