The first concern of anyone using any new medicine is "Is it safe?". The short answer is yes, homeopathic medicine is completely safe. However, you should not stop taking any existing medication without first consulting your doctor.
Dosage and Potency
Not all homeopaths agree on dosage and potency, and the potency to be taken depends on both the sensitivity of the patient, and the exact remedy being taken. But as a general rule, chronic illnesses (i.e. those that you've had for a long time) should be treated with high numbers i.e. 30C - 200C and Acute (i.e. those that are relatively new) with low numbers i.e 6C.
However, 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. Low numbers are used more frequently than high numbers.
Another general rule is that high potency homeopathic medicine should only be taken when you know it is the right remedy, so start off with a low potency remedy, and then increase the potency if improvement is felt, though incomplete.
Taking Homeopathic Medicine
Homeopathic medicine should be taken on a clean pallet. While on a course of homeopathic treatment, you should avoid strong flavours such as mint (including toothpaste), coffee or camphor.
They are normally taken as pills which are placed under the tongue. Take two tablets every two hours for the first six doses, and then four times daily for up to five days. For some complaints remedies are taken as an ointment, for example, arnica cream applied directly to bruising.
If you are taking the remedy in pill form, you should avoid contact with the skin (including fingers). Just drop a few pills into the lid and pour them directly into the mouth.
Once relief from the symptoms if felt, stop taking the homeopathic medicine. Only take it again if exactly the same symptoms come back.
A professional Homeopath will also assess your diet and lifestyle.