This product is a blood volume expander. Its volume expansion effect and blood dilution effect depend on the molecular weight, degree of substitution, substitution mode and drug concentration, as well as the dosage and infusion rate. After healthy volunteers infused 500ml of this product within 30 minutes, their volume expansion effect was 100% of the infusion volume of this product, and this 100% volume effect can be maintained stably for 4-6 hours. Using this product for isovolumetric blood replacement can maintain blood volume for at least 6 hours.

This product is a blood volume expander. Its volume expansion effect and blood dilution effect depend on the molecular weight, degree of substitution, substitution mode and drug concentration, as well as the dosage and infusion rate. After 500ml of this product was infused into healthy volunteers within 30 minutes, its volume expansion effect was 100% of the infusion volume of this product, and this 100% volume effect can be stably maintained for 4-6 hours. This product can maintain blood volume for at least 6 hours by isovolumetric blood replacement. In the subchronic toxicity test study of dogs and rats, this product was intravenously infused at 9g/kg body weight daily for 3 consecutive months, and no toxic reaction was found. During the administration period, due to the increase in liver and kidney stress response under non-physiological conditions, it can be observed that the reticuloendothelial system, liver parenchyma and other tissues of the test animals have increased uptake and metabolism of hydroxyethyl starch. The minimum toxic dose of this product for daily intravenous infusion is higher than 9g/kg body weight, which is equivalent to more than 3 times the maximum therapeutic dose of humans. Studies conducted in rats or rabbits have shown that this product has no teratogenic toxicity. When rabbits were infused with 10% hydroxyethyl starch 130/0.4 solution 50ml/kg daily, embryonic death was observed. When pregnant and lactating rats were given a single bolus of the above dose, delayed weight gain and growth of the pups were observed, and increased fluid load was observed in the mother. No studies have been conducted on the effects of this product on fertility.

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Telmisartan is a specific angiotensin II receptor (ATⅠ type) antagonist. Telmisartan replaces angiotensin II receptors and binds to ATⅠ receptor subtypes with high affinity. It has no agonist effect at any site on the ATⅠ receptor site and selectively binds to ATⅠ receptors. This binding effect is long-lasting. Telmisartan has no affinity for other receptors (including AT2 and other AT receptors with fewer characteristics). The functions of the above other receptors are not yet known, and the excessive receptor stimulation effect that may be caused by the increase in angiotensin II levels caused by telmisartan is also unknown. Telmisartan does not inhibit human plasma renin or block ion channels. Telmisartan does not inhibit angiotensin converting enzyme II, which can also degrade bradykinin and cause adverse reactions. In humans, administration of 80 mg of telmisartan can almost completely inhibit the increase in blood pressure caused by angiotensin II. The inhibitory effect lasts for 24 hours and can still be measured after 48 hours. The antihypertensive effect gradually becomes obvious within 3 hours after the first dose of telmisartan. The maximum antihypertensive effect can be achieved 4 weeks after the start of treatment and can be maintained in long-term treatment. If telmisartan treatment is suddenly discontinued, blood pressure will gradually return to pre-treatment levels after a few days without rebound hypertension. In a clinical trial directly comparing two antihypertensive drugs, the incidence of dry cough in the telmisartan treatment group was significantly lower than that in the angiotensin-converting enzyme inhibitor treatment group.