Prof. George Vithoulkas talks about the homeopathic remedy Hyoscyamus during one of his homeopathic courses at Alonissos, describing the essentials of the materia medica of the remedy, along with some interesting cases and aspects of the remedy.
You can find the complete teachings of Prof. Vithoulkas at the academic e-learning program http://www.vithoulkas.edu.gr
and www.vithoulkas.edu.gr/es for spanish speaking people