Phosphoric acid has traditionally been used for symptoms associated with mental and physical debility. Ailments from loss of fluids, grief or mental shock; mental debility first then physical.
Indifferent, apathetic or physically weak with grief. Silent suffering and very slow to answer, they just want to be alone due to a lack of energy. The state can come on after the initial shock has passed and the long-term reality of loss has set in.
Always read the label. Homoeopathic principles should be applied when using this remedy. If symptoms persist consult your health care professional promptly.