In addition, through an effect in the central nervous system cardiac glycosides cause an increase in parasympathetic activity and therefore slow conduction through the AV node, hence their usefulness in atrial flutter and atrial fibrillation. However, cardiac glycosides have a very low therapeutic ratio and can be very toxic. Slowing of AV conduction can lead to AV block and arrhythmias. These signs could be confused with clinical deterioration. Withdrawal of the drug usually results in recovery, but severe digoxin toxicity can be treated in an emergency by intravenous injection of digoxin specific antibody fragment, which neutralizes toxic effects.

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Examples of drugs originally from natural sources and still in use today are quinine, digitalis (from the foxglove and used for heart failure) and aspirin (extracted from the bark of willow tree and originally used to treat fever). Development of new drugs can happen in many ways. Drugs have been developed following observation of side effects when being used for other purposes. As knowledge of receptor structures has developed, this has allowed drugs to be designed to fit with receptors. The human genome project and mapping of genes has led to work on the development of drugs to alter genes. The importance of pharmacology to health care professionals cannot be overestimated. Members of the three professions, physiotherapy, podiatry and radiography, encounter patients on a daily basis, many of whom will be on drug therapy.

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There are two major routes of drug administration: enteral and parenteral. Enteral means to do with the gastrointestinal tract and includes oral and rectal administration. The parenteral route includes all other means of drug administration. There are many routes of parenteral administration, some of which are intended for a drug to have a systemic effect and others for a local effect. See Figure (In some definitions, parenteral is synonymous with injection (for example in the Medicines Act), but here the term is used to describe all routes of administration that are not enteral.

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Some drugs have to be metabolized in order to become active. Prodrugs are drugs that have been designed to remain inactive until they have been metabolized by the body. They may be formulated in this way because the active drug is difficult to administer, whereas the inactive prodrug does not cause the same complications, or because the active drug is not absorbed or distributed to its intended site of action easily. Most tissues in the body have the enzymes capable of metabolizing a variety of substances. However, as one of the main functions of the liver is the metabolism of toxic substances produced during normal metabolic processes, it is not surprising that the majority of drug metabolism takes place in the liver.

Side effects are rare, but patients may get a dry mouth, urinary retention and constipation, all of which are typical effects of parasympathetic inhibition. High doses of antimuscarinic bronchodilators should not be used if the patient has glaucoma or an enlarged prostate gland, because they would make the glaucoma and urinary retention worse. Xanthines are a group of drugs that directly cause relaxation of bronchial smooth muscle and some central respiratory stimulation. They also have a slight diuretic effect. Xanthines are of principle use in the immediate phase reaction of asthma but also have some effect on the late phase reaction. They are used to treat severe acute asthma attacks and chronic asthma, in particular control of nocturnal asthma and early morning wheezing.

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Adverse effects of carbamezepine are similar to those seen with phenytoin. They include the relatively mild drowsiness, dizziness and ataxia, to the more severe mental and motor disturbances. The drug can also cause gastrointestinal disturbances and arrhythmia. More rarely, severe hypersensitivity reactions including fatal bone marrow depression have been reported. (For use of carbamazepine in neuropathic pain Valproate is effective in all types of epilepsy and is especially useful in children and older people because it does not cause sedation and generally has low toxicity. It is considered to be first-line treatment for generalized seizures.

Other routes of topical administration include application of drugs to the conjunctiva of the eye, the external ear, the vagina and the urethra, usually to treat local infection. Many drugs are given by inhalation and may be intended to have a local or systemic effect. The lungs are adapted for absorption of oxygen having a large surface area for diffusion and a good blood supply. Particle size is a major determinant of absorption from this site of administration. Small particle size favours systemic absorption whereas large particle size discourages absorption into the systemic circulation.

The study of the fate of drugs in the buy nolvadex pct online is known as pharmacokinetics. In order to get to their site of action in the body, drugs have to be administered in some way. There are two major routes of drug administration: enteral and parenteral. Enteral means to do with the gastrointestinal tract and includes oral and rectal administration. The parenteral route includes all other means of drug administration.

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