Here is a brief summary of the list of medications and their brands organized by letter:

A - Acebutolol (46)
B - Baclofeno (184)
C - Celecoxib (110)
D - Doxazosin (94)
E - Efavirenz (107)
F - Furosemida (305)
G - Gabapentina (168)
H - Hydrocortisona (294)
I - Ibuprofeno (104)
J - Indomethacin (296)
K - Ketotifol (267)
L - Labetalol (44)
M - Metoclopramide (185)
N - Nifedipina (302)
O - Omeprazole (257)
P - Paroxetina (65)
Q - Quinine (165)
R - Ranitidina (256)
S - Sildenafil (114)
T - Tamoxifeno (325)
U - Urecholine (204)
V - Velaxlav (104)
W - Warfarin (298)
X - Xaliproden (75)
Y - Yohimbine (168)
Z - Zafirlukast (165)

Note: This list includes some of the most commonly prescribed medications in Spain, but it is important to consult a medical professional for proper diagnosis and treatment.