Drugs for stuffy nose, sinus trouble, congestion and the common "cold" constitute the largest segment of the over-the-counter market for America's pharmaceutical industry. When used wisely, they provide welcome relief for at least some of the discomforts that affect almost everyone at one time or another and that affect many people chronically.
Drugs in these categories are useful for relief of symptoms from allergies, upper respiratory infections (i.e., sinusitis, "colds," flu) and vasomotor rhinitis (a chronic stuffy nose caused by such unrelated conditions as emotional stress, thyroid disease, pregnancy and others). These drugs do not cure the allergies, infections, etc.; they only relieve the symptoms, thereby making the patient more comfortable.
Histamine is an important body chemical that is responsible for the congestion, sneezing and runny nose that a patient suffers with an allergic attack or an infection. Antihistamine drugs block the action of histamine, therefore reducing the allergy symptoms. For the best result, antihistamines should be taken before allergic symptoms get well established.
The most annoying side effect that antihistamines produce is drowsiness. That may be desirable when taken at bedtime, but it is a nuisance to many people who need to use antihistamines in the daytime. To some people, it is even hazardous. These drugs are not recommended for daytime use for people who may bedriving an automobile or operating equipment that could be dangerous. The first few doses cause the most sleepiness; subsequent doses are usually less troublesome.
Typical antihistamines include Benadryl, Chlor-Trimeton, Dimetane, Hismanal Nolahist, PBZ, Polaromine, Seldane, Tavist, and Teldrin.
Congestion in the nose, sinuses and chest is due to swollen, expanded or dilated blood vessels in the membranes of the nose and air passages. These membranes have an abundant supply of blood vessels with a great capacity for expansion (swelling and congestion). Histamine stimulates these blood vessels to expand as described previously.
Decongestants, on the other hand, cause constriction or tightening of the blood vessels in those membranes, which then forces much of the blood out of themembranes so that they shrink and the air passages open up again.
Decongestants are chemically related to adrenaline, the natural decongestant, which is also a type of stimulant. Therefore, the side effect of decongestants is a jittery or nervous feeling. They can cause difficulty in going to sleep, and they can elevate blood pressure and pulse rate. Decongestants should not be used by a patient who has an irregular head rhythm (pulse), high blood pressure or heart disease. They also should not be used by a patient who has glaucoma. Some patients taking decongestants experience difficulty with urination. Furthermore, decongestants are often used as ingredients in diet pills. Therefore to avoid excessively stimulating effects, patients taking such diet pills should not take decongestants also, and vice versa.
Typical decongestants are phenylephrine (NeoSynephrine), phenylpropanolamine (Entex, Propagest, and pseudoephedrine (Novafed, Sudafed).
Theoretically, if the side effects could be properly balanced, the sleepiness caused by antihistamines could be cancelled by the stimulation of decongestants. Therefore, numerous combinations of antihistamines with decongestants are available: Actifed, A.R.M., Chlor-Trimeton D, Contac, CoPyronil 2, Deconamine Demazin, Dimetapp, Drixoral, lsoclor, Nolamine Novafed A, Ornade, Sudafed Plus, Tavist D, Triaminic, and Trinalin just to name a few.
A patient may find one preparation quite helpful for several months or years; Then he may need to switch to another one later when the first loses its effectiveness.
Since no one reacts exactly the same as another to the side effects of these drugs, a patient may wish to try his own ideas on adjusting the dosages. For example, he might take the antihistamine only at night and take the decongestant alone in the daytime. Or he might take them together, increasing the dosage of antihistamine at night (while decreasing the decongestant dose) and then doing quite the opposite for daytime use. For example:
Antihistamine (Chlor-Trimeton 4 mg) - one tablet three times daily and two tablets at bedtime.
Decongestant (Sudafed 30 mg) - two tablets three times daily and one tablet at bedtime.
|Combinations of above||
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