By C. Ugolf. Rhode Island College.
The patent should also be monitored regularly during chemotherapy and cytotoxic drugs withheld if there is signif- cant deterioraton in bone-marrow cheap sildalis 120mg on line, liver or kidney functon generic sildalis 120 mg fast delivery. Contraceptve measures are required during therapy and possibly for a period afer therapy has ended. Cytotoxic drugs should be administered with care to avoid undue toxicity to the patent or exposure during handling by the health care provider. All waste, including patent’s body fuids and excreta (and any material contaminated by them) should be treated as hazardous. Extravasaton of intravenously administered cytotoxic drugs can result in severe pain and necrosis of surrounding tssue. If extravasaton occurs, aspiraton of the drug should frst be atempted, then the afected limb is elevated and warm compresses applied to speed and dilute the infusion or it is localized by applying cold compresses untl the infamma- ton subsides; in severe cases, hydrocortsone cream may be applied topically to the site of infammaton. The manufac- turer’s literature should also be consulted for more specifc informaton. Adverse Efects Cytotoxic drugs have a considerable potental to damage normal tssue. Specifc adverse efects apply, but a number of efects are common to all cytotoxics such as bone-marrow and immunological suppression. Furthermore, the concomitant use of immunosuppressive drugs will enhance susceptbility to infectons. Fever associated with neutropenia or immuno- suppression requires immediate treatment with antbiotcs. Nausea and vomitng: Nausea and vomitng following admin- istraton of cytotoxic drugs and abdominal radiotherapy are ofen distressing and may compromise further treatment. Symptoms may be acute (occurring within 24 h of treatment), delayed (frst occurring more than 24 h afer treatment), or antcipatory (occurring before subsequent doses). Delayed and antcipatory symptoms are more difcult to control than acute symptoms and require diferent management. Cytotoxic drugs associated with a low risk of emesis include etoposide, 5- fuorouracil, low-dose methotrexate and the vinca alkaloids; those with an intermediate risk include low- dose cyclophosphamide, doxorubicin and high-dose meth- otrexate; and the highest risk is with cisplatn, high-dose cyclophosphamide and dacarbazine. For patents at a low risk of emesis, pretreatment with an oral phenothiazine (for example chlorpromazine), contnued for up to 24 h afer chemotherapy, is ofen helpful. For patents at a high risk of emesis or when other therapies are inefectve, high doses of intrave- nous metoclopramide may be used. Note: High doses of metoclopramide are preferably given by contnuous intravenous infusion: an inital dose of 2-4 mg/kg is given over 15 to 20 min, followed by a maintenance dose of 3-5 mg/kg over 8 to 12 h; the total dose should not exceed 10 mg/kg in 24 h. Dexamethasone is the drug of choice for the preventon of delayed symptoms; it is used alone or with metoclopramide. Good symptom control is the best way to prevent antcipa- tory symptoms and the additon of diazepam to antemetc therapy is helpful because of its sedatve, anxiolytc and amnesic efects. Hyperuricaemia: Hyperuricaemia may complicate treat- ment of conditons such as non-Hodgkin’s lymphomas and leukaemia. Patents should be adequately hydrated and hyperuricaemia may be managed with allopurinol initated 24 h before cytotoxic treatment and contnued for 7 to 10 days aferwards. There is no drug treatment, but the conditon ofen reverses spontaneously once treatment has stopped. Alkylatng Drugs: Alkylatng drugs are among the most widely used drugs in cancer chemotherapy. Firstly, they afect gametogenesis and may cause permanent male sterility; in women, the reproductve span may be shortened by the onset of a premature meno- pause. Secondly, they are associated with a marked increase in the incidence of acute non-lymphocytc leukaemia, in partcular when combined with extensive radiaton therapy. Cyclophosphamide requires hepatc actvaton; it can there- fore be given orally and is not vesicant when given intrave- nously. Like all alkylatng drugs its major toxic efects are myelosuppression, alopecia, nausea and vomitng. It can also cause haemorrhagic cystts; an increased fuid intake for 24 to 48 h will help to avoid this complicaton. Cyclophosphamide is used either as part of treatment or as an adjuvant in Non- Hodgkin’s lymphomas, breast cancer, childhood leukaemia and ovarian cancer. However, severe widespread rash can develop and may progress to Stevens-Johnson syndrome or toxic epidermal necrolysis. Chlormethine (mustne) forms part of the regimen for treatment of advanced Hodgkin’s disease and malignant lymphomas. Its toxicity includes myelosuppression, severe nausea and vomitng, alopecia and thrombophlebits due to vesicant efect. Cytotoxic Antbiotcs: Bleomycin is used in regimens for the treatment of Hodgkin’s disease and testcular cancer. It has several antneoplastc drug toxicites; it is known to cause dose-related pneumonits and fbrosis which can be fatal and is associated with rare acute hypersensitvity reactons.
The chlorinated phenolic compound generic sildalis 120 mg free shipping, chloroxylenol buy sildalis 120 mg cheap, is efec- tve against a wide range of Gram-positve bacteria. It is less efectve against staphylococci and Gram-negatve bacteria; it is ofen inefectve against Pseudomonas spp. The aldehyde bactericidal disinfectant, glutaraldehyde, is strongly actve against both Gram-positve and Gram-negatve bacteria. A 2% w/v aqueous alkaline (bufered to pH 8) glutaral soluton can be used to sterilize heat-sensitve pre-cleansed instruments and other equipments. Dose Surface disinfecton (minor contaminaton): apply solutons containing 1000 parts per million. Instrument disinfecton: soak in soluton containing 1000 parts per million for a minimum of 15 min; to avoid corrosion do not soak for more than 30 min; rinse with sterile water. Chloroxylenol Pregnancy Category-C Indicatons Antseptc; disinfecton of instruments and surfaces. Dose Antseptc (wounds and other skin damage): apply a 1 in 20 diluton of 5% concentrate in water. Disinfecton of instruments: use a 1 in 20 diluton of 5% concentrate in alcohol (70%). Precautons Aqueous solutons should be freshly prepared; appropriate measures required to prevent contaminaton during storage or diluton; pregnancy (Appendix 7c); lactaton. Precautons Signifcant peripheral neuropathy; patents with diabetes at risk of neuropathic ulcers; protect surrounding skin and avoid broken skin; not suitable for applicaton to face; anogenital region; or large areas; increased levels of serum aminotransferase. Glutaraldehyde* Indicatons Disinfecton and sterilizaton of instruments and surfaces; conditons like warts and hyperhidrosis of palms and soles. Dose Disinfecton of clean instruments - immerse in undiluted soluton for 10 to 20 min; up to 2 h may be required for certain instruments (for example bronchoscopes with possible mycobacterial contaminaton); rinse with sterile water or alcohol afer disinfecton. Sterilizaton of clean instruments - Immerse in undiluted soluton for up to 10 h; rinse with sterile water or alcohol afer disinfecton. Precautons Minimize occupatonal exposure by adequate skin protecton and measures to avoid inhalaton of vapour; lung damage; oral and nasal lesions, if swallowed do not induce vomitng. Adverse Efects Nausea (occupatonal exposure); headache; airway obstructon; asthma; rhinits; eye irritaton and dermatts and skin discolouraton. Management depends on the type of angina and may include drug treatment, coronary artery bypass surgery, or percuta- neous transluminal coronary angioplasty. Stable Angina: Drugs are used both for the relief of acute pain and for proph- ylaxis to reduce further atacks; they include organic nitrates, beta-adrenoceptor antagonists (beta-blockers) and calcium- channel blockers. Nitrates: Organic nitrates have a vasodilatng efect; they are some- tmes used alone, especially in elderly patents with infre- quent symptoms. Tolerance leading to reduced antanginal efect is ofen seen in patents taking prolonged-acton nitrate formulatons. Evidence suggests that patents should have a ‘nitrate-free’ interval to prevent the development of toler- ance. Adverse efects such as fushing, headache and postural hypotension may limit nitrate therapy but tolerance to these efects also soon develops. The short-actng sublingual formulaton of glyceryl trinitrate is used both for preventon of angina before exercise or other stress and for rapid treat- ment of chest pain. A sublingual tablet of isosorbide dinitrate is more stable in storage than glyceryl trinitrate and is useful in patents who require nitrates infrequently; it has a slower onset of acton, but efects persist for several h. Beta-blockers are frst-line therapy for patents with efort-induced chronic stable angina; they improve exercise tolerance, relieve symp- toms, reduce the severity and frequency of angina atacks and increase the anginal threshold. Beta-blockers should be withdrawn gradually to avoid precipi- tatng an anginal atack; they should not be used in patents with underlying coronary vasospasm (Prinzmetal’s angina). Beta-blockers may precipitate asthma and should not be used in patents with asthma or a history of obstructve airways disease. Some, including atenolol, have less efect on β2 (bronchial) receptors and are therefore relatvely cardioselec- tve. Although they have less efect on airways resistance they are not free of this efect and should be avoided. Beta-blockers slow the heart and may induce myocardial depres- sion, rarely, precipitatng heart failure. They should not be given to patents who have incipient ventricular failure, second-or third- degree atrioventricular block, or peripheral vascular disease. Beta-blockers should be used with cauton in diabetes since they may mask the symptoms of hypoglycaemia, such as rapid heart rate. Beta-blockers enhance the hypoglycaemic efect of insulin and may precipitate hypoglycaemia.
Ecstasy-related deaths are very rare and deaths from cannabis overdose do not occur order sildalis 120 mg on line. These can result from the illegality of the drugs generic 120mg sildalis overnight delivery, or from factors such as the psychopharmacological effects of the drug. They have associated costs for the individual related to loss of earnings, reduced educational attainment and damage to personal relationships. High levels of drug use in a community are linked to unsafe communities because of the associated social problems. The relative levels of harm for the different drugs correlate poorly with the legal classification of drugs. The economic and social costs of Class A drug use in 2003-2004 in England and Wales were estimated to be £15. There is general consensus that drug use is a multifaceted ‘biopsychosocial’ phenomenon. This term is used to encapsulate that drug use is influenced by biological, psychological and social factors. Although distinct theories have been developed for each of these factors, which are discussed in this chapter, there is often a degree of overlap between these explanations. Using only one model to explain why people use drugs may not be appropriate to describe all types of behaviour. In addition to biopsychosocial influences, the extent to which drugs are obtainable and aspirational is thought to influence their use. It should be noted that there are similarities between what influences illicit drug use and what influences alcohol and tobacco use. The following case study illustrates the multifactorial aetiology of drug dependence. He has not used any heroin or other opioid drugs for the past four years and has not injected at all for the past eight years. His main problem is his alcohol use, which has been increasing ever since he came into treatment and became much worse when he stopped using heroin. He is now drinking about two cans of strong lager (10 units) several days a week, although he is sometimes able to stay off alcohol for two or three days per week. He was offered treatment then, but as he did not want to have a liver biopsy did not want to be referred. Two years ago he was admitted to hospital with jaundice and ascites and diagnosed with advanced hepatic cirrhosis. He did well during that admission, and following medical treatment improved substantially and was able to return to work. This was not started though, as he continued to drink alcohol after a short (3-month) period of abstinence. His mother was depressed and he was taken into care when his behaviour became unmanageable as a teenager. As an older adolescent, he was caught by the police a few times for minor acquisitive offending and served one short sentence in a young offenders’ unit. He spent some time in South America in his 20s but returned to England and started working as a computer technician. He still works freelance and is able to get work from a friend who runs his own business. He has a keyworker (see Glossary) but does not use the sessions well and generally just wants to collect a prescription. Again he did well and was booked in to see the hepatitis clinical nurse specialist to talk about interferon and ribavarin treatment. The hepatologist explained to him in detail the prognostic implications of his liver damage and the nature of the treatment. He was also advised to stay on methadone (for a discussion of methadone therapy, see Chapter 8), as further withdrawal symptoms may have jeopardised his ability to stay free of illicit drugs and alcohol. Case study details provided by Dr Emily Finch, a consultant addiction psychiatrist. This means that not every person will themselves carry the gene or become drug dependent. Evidence for the heritability of drug use is derived from a range of research designs. The most robust evidence for the genetic influence of drug use comes from twin studies; research using family- and adoption-based designs has also shown an effect. Given the breadth of high-quality research using twin studies, this section will only briefly examine family- and adoption-based designs, before focusing on twin studies. While there is evidence that substance use disorders cluster in families, it is not clear from family-based designs whether these can be wholly attributable to heritable factors.
Cognate Assays A number of pharmaceutical substances may be determined quantitatively by titration with bromine as given in Table 13 buy cheap sildalis 120mg online. Transfer the solution quantitatively into a 1 litre volumetric flask and make up the volume to the mark buy sildalis 120mg on-line. Mix the contents thoroughly and allow it to stand for 5 minutes with its stopper in position. Carry out a blank run using the same quantities of the reagents and incorporate the necessary corrections, if any. Mephenesin Theory : Mephenesin undergoes oxidation with bromine to yield a dibromo derivative as expressed in the following equation : BrO – + 6e + 6H+ → Br– + 3H O... Phenol Theory : Phenol interacts with bromine whereby the former undergoes bromination to yield a water- insoluble 2, 4, 6-tribromophenol. Set it aside in a dark place for 20 minutes while shaking the contents frequently in between. Carry out a blank titration simultaneously and incorporate any necessary correction, if required. Cognate Assays A few other pharmaceutical substances may also be assayed by titrating with 0. Under appropriate experimental parameters the iodate reacts quantitatively with both iodides and iodine. It is, however, interesting to observe here that the iodate titrations may be carried out effectively in the presence of saturated organic acids, alcohol and a host of other organic substances. Since, the normality of iodate solution varies significantly depending on the nature of the reaction, therefore, in usual practice standard iodate solutions of known molarity are used. In a situation, whereby excess of potassium iodate is employed, any I– formed [Eq. Interestingly, at higher concentrations of hydrochloric acid, both the iodide and iodine obtained as reduction products of iodate [Eqs. Iodine is liberated at the initial stages of the titration which renders the chloroform layer coloured. At that material point when all the reducing agent under estimation has been duly oxidized, the iodate completes the oxidation of iodine and iodide to I+, and hence the colour from the chloroform layer disappears. Shake the contents thoroughly, allow to separate and collect the chloroform layer in another separating funnel. Treat the aqueous layer with 3 further quantities each of 10 ml of chloroform and discard the chloroform layer. Add 2 ml of chloroform and continue the titration until the chlorofonn layer becomes colourless. Potassium Iodide Theory : The iodine monochloride method described earlier employing standard potassium iodate is the basis for the official assay of potassium iodide. Vigorous shaking is a prime requirement, as the end-point is approached in this assay, because of the fact that both iodine and iodate in different phases attribute a heterogeneous medium. Add the last portion of the iodate solution carefully and dropwise while shaking the contents of the flask vigorously and continuously. Cognate Assays A host of other pharmaceutical substances, namely : cetrimide, hydralazine hydrochloride, phenylhydrazine hydrochloride may be assayed by titration with potassium iodate as mentioned in Table : 13. Why is ‘bromine’ preferred to ‘iodine’ in redox methods for the assay of pharmaceutical organic substances? Wingrove, ‘An Introduction to Modern Experimental Organic Chemistry’, New York, Holt, Rienhart and Winsten, 1985. Moody, ‘Experimental Organic Chemistry’, London, Blackwell Scientific Publications, 1989. But unquestionably the most important of these is the one proposed by Karl Fischer (1935), which is considered to be relatively specific for water*. It essentially makes use of the Karl Fischer reagent which is composed of iodine, sulphur dioxide, pyridine and methanol. It is pertinent to mention here that in the presence of a large excess of pyridine (C5H5N), all reactants as well as the resulting products of reaction mostly exist as complexes as evident from Eqs. Stability of the Reagent : The stability of the original Karl Fischer reagent initially prepared with an excess of methanol was found to be fairly poor and hence, evidently needed frequent standardization. However, it was estabtished subsequently that the stability could be improved significantly by replacing the methanol by 2-methoxyethanol. It has been observed that the titer of the Karl Fischer reagent, which stands at 3. Hence, the following precautions must be observed rigidly using the Karl Fischer reagent, namely : (a) Always prepare the reagent a day or two before it is to be used, (b) Great care must be taken to prevent and check any possible contamination either of the reagent or the sample by atmospheric moisture, (c) All glassware(s) must be thoroughly dried before use, (d) Standard solution should be stored out of contact with air, and (e) Essential to minimise contact between the atmosphere and the solution during the course of titration.
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