Tuberculosis infection is difficult to treat and requires a combination of at least three different antibiotics. Viral infections are normally overcome by the patients immune system. However, the advent of HIV infections and AIDS has led to the development of several new antiviral drugs. Antiviral drugs work by inhibiting the synthesis of viral DNA, RNA or proteins; by reducing the release of viral genetic material inside host cells; by interfering with viral penetration of host cell membranes; and by interfering with acyclovir 400 mg for of virus to host cell membranes. Resistance to antiviral drugs can occur by a number of mechanisms.

Side effects of topical acyclovir are rare. Use of the drug intravenously to treat systemic herpes can cause nausea and headache and possibly kidney damage. Ganciclovir is similar in mode of action. Adverse reactions can be severe so this drug is reserved for acyclovir 400 mg for viral infections such as cytomegalovirus in immunocompromized patients. Adverse effects include bone marrow suppression, liver and kidney toxicity and central nervous system damage.

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.

Toxic effects of lithium can be fatal. Early signs of lithium toxicity are vomiting and severe diarrhoea followed by tremor, ataxia, renal impairment and convulsions. Many non-steroidal anti-inflammatory drugs interact with lithium to increase its plasma concentration and risk of toxicity. Aspirin is an exception and safe to use with lithium.

Less serious allergic rhinitis and hay fever are treated mainly with antihistamines and decongestants. Cystic fibrosis is a serious inherited disorder where abnormally viscous mucus can cause obstruction of bronchioles and lead to frequent infection. Management of cystic fibrosis is through a combination of physiotherapy and antibiotics. It is important to identify infecting micro-organisms for effective individual treatment. Pneumonia can result from infection by bacteria, viruses or fungi.

When the renal This glycosuria causes osmotic diuresis and polyuria. Loss of fluid causes dehydration and increased thirst and polydipsia. Other metabolic disturbances are seen, including protein wasting and ketosis due to increased lipid breakdown. Long-term complications develop, many due to disease of blood vessels. Atheroma is common and this increases the risk of heart disease and stroke in diabetics.

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Structurally the brain can be divided into the central core, the deep brain nuclei and the cerebral cortex. The central core includes the brain stem, which controls automatic functions of the body like breathing and rate of heart beat. At the back of the brain stem is the cerebellum, which is concerned primarily with the fine control of movement. Above the brain stem is the hypothalamus and thalamus, which together make the diencephalon.

Without this enzyme, only glucose can be absorbed effectively from the intestine. The effect of acarbose is to reduce the postprandial rise in blood glucose levels. Adverse effects of acarbose are abdominal discomfort and flatulence. Prandial glucose regulators are relatively new oral hypoglycaemics.

These drugs are recommended for use in women over history of fractures. Hormone replacement therapy with oestrogen and progesterone is no longer recommended and should not be used as first line treatment in post-menopausal women for osteoporosis. This is because of the increased risk of breast, endometrial and ovarian cancer with HRT. Its use should be reserved for patients in whom other drugs are contraindicated, not tolerated or ineffective. HRT is most effective if started early in the menopause and continued for up to five years (after which osteoporosis will return, possibly at an accelerated rate).

Infliximab and adalimumab should both be used together with methotrexate. Infliximab is given by intravenous infusion every eight weeks. Adalimumab is given by sub-cutaneous injection on alternate weeks and should only be used for moderate to severe rheumatoid arthritis and active progressive psoriatic arthritis. TNF-α inhibitors are associated with increased risk of severe infections, for example with TB, and septicaemia.

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Impetigo on small areas of skin can be treated with topical application of fusidic acid. Extensive impetigo needs treating with a systemic antibacterial such as flucloxacillin. There are many topical antibacterials available.

The commonest forms of generalized epilepsy are tonicclonic and absence seizures. Tonicclonic seizures are major convulsions involving spasm of all muscles. There is loss of consciousness and possibly incontinence.

Doxorubicin prevents this. Doxorubicin is used to treat leukaemia, lymphoma and many solid tumours. Apart from nausea and vomiting and bone marrow suppression, adverse effects with doxorubicin are cardiotoxicity and possibility of cardiac failure. Dactinomycin binds to guanine in DNA and prevents the movement of RNA polymerase, so interfering with protein synthesis.

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