These drugs work by stimulating the salivary glands to produce saliva. They will only work if the damage to the glands is temporary or partial, unfortunately, they do not work if the damage to the glands is permanent. Also, it may take two or three months of continuous treatment with pilocarpine before it is effective. This is the time it can take to stimulate temporarily damaged salivary glands to work again. However, like all drugs they have side effects.
Pilocarpine can cause sweats and nausea and vomiting.
Nicotinic acid can cause dizziness, headaches and sometimes palpitations. Artificial saliva products can also be helpful. As their effect may last only for a short time, it is best to use them just before meals and at night to prevent dryness disturbing your sleep. Several brands are available and they come in the form of a gel, spray, pastille or lozenge. You may find it helpful to try more than one form of artificial saliva and brand to find out which one suits you best.