Table 5.

Individual analgesics used as rescue medication with number of patients given in brackets.

Week from randomization	α-Lipoic acid treatment	α-Lipoic acid withdrawal
Week 4	(i) Ibuprofen (1) (ii) Ketorolac (1)	(i) Amitriptyline (1) (ii) Ketorolac (2)
Week 8	(i) Amitriptyline (1) (ii) Ibuprofen (1) (iii) Ketorolac (2)	(i) Amitriptyline (1) (ii) Tramadol (1) (iii) Dextropropoxyphene (1) (iv) Gabapentin (2) (v) Diclofenac (1)
Week 12	(i) Tramadol (1) (ii) Dextropropoxyphene (1) (iii) Ibuprofen (1)	(i) Amitriptyline (2) (ii) Diclofenac plus vitamin B (2) (iii) Meloxicam (2) (iv) Gabapentin (2)
Week 16	(i) Tramadol (1) (ii) Naproxen (1) (iii) Paracetamol (1) (iv) Ibuprofen (1)	(i) Amitriptyline (2) (ii) Diclofenac plus vitamin B (2) (iii) Meloxicam (2) (iv) Gabapentin (2)