Adverse reactions transporters

Toxic anoxia caused by damage to the body s oxygen transport or utilization by adverse reaction of biologically active substances. 

Levodopa, the metabolic precursor of dopamine, is the most effective agent in the treatment of Parkinson s disease but not for drug-induced Parkinsonism. Oral levodopa is absorbed by an active transport system for aromatic amino acids. Levodopa has a short elimination half-life of 1-3 hours. Transport over the blood-brain barrier is also mediated by an active process. In the brain levodopa is converted to dopamine by decarboxylation and both its therapeutic and adverse effects are mediated by dopamine. Either re-uptake of dopamine takes place or it is metabolized, mainly by monoamine oxidases. The isoenzyme monoamine oxidase B (MAO-B) is responsible for the majority of oxidative metabolism of dopamine in the striatum. As considerable peripheral conversion of levodopa to dopamine takes place large doses of the drug are needed if given alone. Such doses are associated with a high rate of side effects, especially nausea and vomiting but also cardiovascular adverse reactions. Peripheral dopa decarboxylase inhibitors like carbidopa or benserazide do not cross the blood-brain barrier and therefore only interfere with levodopa decarboxylation in the periphery. The combined treatment with levodopa with a peripheral decarboxylase inhibitor considerably decreases oral levodopa doses. However it should be realized that neuropsychiatric complications are not prevented by decarboxylase inhibitors as even with lower doses relatively more levodopa becomes available in the brain. 

Potent opioids act through opioid receptors in the central nervous system where they inhibit the transport of pain impulses. They are mostly used for treatment of malignant cancer pain and for post-operative pain. Severe, long-term non-malignant pain, e.g. in ischaemic leg ulcers, sometimes necessitates the use of opioids. The risk of treatment discontinuation due to adverse reactions is high. 

Steroids - Two recent reviews summarize the adverse reactions from use of the "pill". The "paper pill", a square of edible cellulose impregnated with the steroids, is advantageous with respect to packaging, transportation, acceptability and storage. The conventional and the "paper pill", each containing 150 yg of levonorgestrel and 30 yg of ethynylestra-diol (EE), were equally effective in suppressing ovulation.The EE content of the "pill" was lowered to 30 yg without loss of contraceptive... 

Office employee suffering from acute allergies and Asthma had an adverse reaction to the cutting of weeds. The employee was transported to the hospital for treatment. Hospital doctors recommended she remain for observation and released the next day. 

These drugs are used to treat leukaemia, lymphoma, testicular cancer and lung cancer. Adverse reactions of vinca alkaloids are relatively mild. Some are due to the inhibition of other functions of microtubules. Thus migration of white blood cells and axonal transport in neurons are inhibited leading increased susceptibility to infection and neurotoxicity respectively. 

Tigecycline is an antiinfective/glycylcycline, which inhibits protein transportation in bacteria by binding to the 30S ribosomal subunit and blocking entry of amino-acyl tKNA molecules into the A site of the ribosome. This prevents incorporation of amino-acid residues into elongating peptide chains. Glycylcycfine class antibiotics are structurally similar to tetracycline class antibiotics and may have similar adverse reactions. 

Blood substitutes were critically reviewed by Chen et al. [23] who reached the conclusion Published animal studies and clinical trials carried out in a perioperative setting have demonstrated that these products successfully transport and deliver oxygen, but all may induce hypertension and lead to unexpectedly low cardiac outputs. Overall, these studies suggest that HBOCs resulted in only modest blood saving during and after surgery, no improvement in mortality and an increased incidence of adverse reactions (p. 803). This assertion is supported by findings of the meta-analysis of Natanson et al. [57] who found that clinical trials associated with blood substitutes increased the risk of mortality by 30% and myocardial infarction 2.7-fold. 

MDMA overdose as well as the concomitant consumption of selective serotonin reuptake inhibitors (SSRI) with other dmgs that exert serotoninergic effects (such as inhibitors of monoamine oxidase) can rapidly lead to the serotonin syndrome. Its symptoms, which are reversible upon cessation, of the drug include confusion, muscle rigidity in the lower limbs, and hyperthermia suggesting an acute reaction to serotonin overflow in the CNS. Blocking the function of SERT outside the brain causes side effects (e.g., nausea), which may be due to elevated 5HT however , impairment of transporter function is not equivalent to direct activation of 5HT recqrtors in causing adverse effects such as fibrosis and pulmonary hypertension. 

Unless ordered otherwise, the nurse should save all stools that are passed after the drug is given. It is important to visually inspect each stool for passage of the helminth. If stool specimens are to be saved for laboratory examination, the nurse follows hospital procedure for saving the stool and transporting it to the laboratory. If the patient is acutely ill or has a massive infection, it is important to monitor vital signs every 4 hours and measure and record fluid intake and output. The nurse observes the patient for adverse drug reactions, as well as severe episodes of diarrhea. It is important to notify the primary health care provider if these occur. 

The main problems with early, irreversible MAOIs were adverse interactions with other drugs (notably sympathomimetics, such as ephedrine, phenylpropanolamine and tricyclic antidepressants) and the infamous "cheese reaction". The cheese reaction is a consequence of accumulation of the dietary and trace amine, tyramine, in noradrenergic neurons when MAO is inhibited. Tyramine, which is found in cheese and certain other foods (particularly fermented food products and dried meats), is normally metabolised by MAO in the gut wall and liver and so little ever reaches the systemic circulation. MAOIs, by inactivating this enzymic shield, enable tyramine to reach the bloodstream and eventually to be taken up by the monoamine transporters on serotonergic and noradrenergic neurons. Fike amphetamine, tyramine reduces the pH gradient across the vesicle membrane which, in turn, causes the vesicular transporter to fail. Transmitter that leaks out of the vesicles into the neuronal cytosol cannot be metabolised because... 

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