Anti-cholinergic drugs were originally used prior to the development of levodopa because many signs of excessive parasympathetic activity are seen in Parkinsons patients (salivation, sweating and incontinence). The basal nuclei contain many excitatory cholinergic neurons. As the nigrostriatal tract progressively degenerates, the release of inhibitory dopamine declines and the cholinergic system becomes relatively overactive. The site of action of anti-cholinergic drugs appears to be at muscarinic receptors in the basal nuclei. However, as the disease progresses, the loss of dopaminergic activity becomes so great that anti-cholinergic drugs cannot compensate for it. An example of an anti-cholinergic drug used in Parkinsons disease is benzatropine, but this drug has to be given by injection, either intramuscularly or intravenously. Trihexyphenidyl is an anti-cholinergic drug that can be given orally.

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The use of medicines is not always optimized, so there can be waste and patients can suffer harmful effects. Consequently, Trusts have medicines management policies in place to address issues such as: managing risk; minimizing potential of harm; maximizing the use of advanced competencies; improving the patient experience; maximizing cost-effective use of resources. Medicines management encompasses all aspects of the use of medicines in NHS Trusts, and includes the selection, procurement, delivery, prescription, dispensing and administration of medicines. Figure part in the management of medicines. The structure, format and terms of reference of medicines management structures and committees vary between Trusts because they are locally agreed, but the existence of medicines management procedures is mandatory. The Drug and Therapeutics Committee plays a critical role in the evaluation of the evidence surrounding a new medicine that is being considered for use within the Trust. This committee has significant support from senior pharmacy and medical staff and it often has the power to review local processes, documentation and systems. As far as radiography is concerned, this committee can have a direct impact on practice.

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Adjuncts to therapeutic radiography, used under patient group directions, include analgesics, laxatives, anti-diarrhoeals, antiemetics and drugs for wound care and skin reactions. Adjuncts used in addition to contrast agents in diagnostic radiography, under patient group directions, include laxatives, drugs to relax the bowel, normal saline and topical anaesthesia. Contrast agents are substances that alter, or attenuate, X-rays. The density of a substance determines the degree of attenuation of radiation. Air and gas can be used as contrast agents. They provide negative contrast because they absorb X-rays less than the surrounding tissue.

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This can result from either differing concentrations of a drug at its site of action, or differing physiological responses to the same concentration of a drug. Adverse drug reactions present a major clinical problem. It has been estimated that up to up to Many adverse reactions are well known. Information about them can be found in patient information leaflets supplied with medicines, in the Monthly Index of Medical Specialties (MIMS) or in the British National Formulary. However, not all patients will suffer all possible adverse reactions.

You should be able to answer these review questions from the material in the preceding chapter. As with cardiac and blood disorders, respiratory disease is relatively common in many older patients. However, there are common respiratory disorders that affect younger people as well. Although there are probably not as many diseases of the respiratory system as there are of the cardiovascular system, there are still a number of important groups of drugs that are used to treat respiratory disorders and their use can be life saving. In order to understand diseases of the respiratory system and how they can be treated, it is necessary to have an overview of the normal function of the respiratory system; that is the structures involved, the mechanism of breathing and gas exchange and the control and variation of breathing rate.

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There are many drugs in each group. The descriptions that follow are not intended to give a comprehensive account of all anti-cancer drugs available, rather to explain the modes of action and to give examples from each group. Toxic effects with all cytotoxic drugs are severe nausea and vomiting, hair loss and bone marrow depression. Alkylating agents act by forming bonds with guanine in DNA. This interferes with the normal base pairing of guanine with cytosine and allows cross-linking of guanine with other guanine molecules in the same strand and opposite strand of DNA. This denatures the DNA and as a result transcription of DNA for protein synthesis and replication of DNA for cell division are disrupted.

This includes the prescribing of: (Black triangle drugs are those recently licensed and still being monitored for adverse reactions; unlicensed medicines are those not licensed in the United Kingdom. ) Before agreeing to the prescribing of high-risk drugs (that is those with known dangerous side effects) in a CMP, the independent prescriber must be confident that the supplementary prescriber has the necessary skills, knowledge and competence. A supplementary prescriber should not agree to prescribe any medicine unless they are confident that it falls within their knowledge and competence. prescriber A professional relationship between the independent prescriber and the supplementary prescriber is paramount to safe and effective supplementary prescribing. The two should be able to communicate easily, share access to the same common patient record and any guidelines used in the CMP, agree common understanding of and access to the written CMP and ideally review the patients progress together at agreed intervals. The responsibilities of the independent prescriber are given below: Initial clinical assessment and diagnosis of the patient Agreement with the supplementary prescriber about the limits of their responsibility Provision of advice and support to the supplementary prescriber Review of patients progress at appropriate intervals with the supplementary prescriber if possible Sharing patients records with supplementary prescriber Reporting of adverse drug reactions.

Due to the synergistic effect of the two drugs, this combination is more effective than either drug alone. Adverse effects on the production of blood cells occur with prolonged use of trimethoprim. The quinolones inhibit a bacterial enzyme, DNA gyrase. This enzyme is involved in the unwinding of DNA prior to replication. Inhibition of this enzyme prevents DNA replication and bacterial cells cannot survive. Human cells contain a different form of DNA gyrase and so are unaffected by these drugs.

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