What potency & dosage should I take?
As a general rule Chronic illnesses (i.e. those that you've had for a long time) should be treated with low potencies (i.e. 6x or 6C) and Acute conditions (i.e. those that are relatively new) with high potencies (i.e. 30x - 200c.) There are exceptions, particularly where an accident started off the symptoms and you might give the body a kick start with a high potency dose such as Arnica 200c first and then follow with a lower potency remedy.
Other factors are also relevant for choosing a potency, such as the homeopathic sensitivity of the patient (more sensitive patients take lower potencies), and the particular remedy being taken; if in doubt, see your homeopath.
If you are not 100% sure which remedy to take, usually a low potency, such as 6X, should be taken before a high potency and the patient observed carefully. If symptoms improve, but not fully, the same remedy should be taken in a higher potency (such as 30C). If, after taking the low potency remedy, relief is not felt, or the condition changes, a different remedy should be taken in a low potency.
Really high potencies, such as 200C, are normally taken in very low doses (typically once per week) whereas lower potencies are taken every few hours for a few days. It is generally considered to be a bad idea to take high potencies often.
Homeopathic remedies should be taken on a clean palate. Strong flavors, such as coffee or toothpaste can disrupt the working of a remedy. Once relief from the symptoms is felt, stop taking the homeopathic medicine. Only take it again if exactly the same symptoms come back.
If symptoms worsen or persist, consult your doctor.