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PharmacyThyroid & HormoneThyro-Tabs Rx 0.2 mg x 120 ct

Thyro-Tabs Rx 0.2 mg x 120 ct

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Reference: 012125-2-120

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0.2 mg x 120 ct

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California Prop 65 WARNING: Cancer and Reproductive Harm - www.p65warnings.ca.gov

Requires Veterinarian Authorization

Product description

For use in dogs for correction of conditions associated with low circulating thyroid hormone (hypothyroidism). Advantages of Thyro-Tabs®: Nine dosage strengths from 0.1 mg to 1.0 mg One convenient package option of a Ready-to-Dispense 120-count bottle Color-coded tablets for easy identification Scored tablets for precise dosage Efficacy proven in independent research Unsurpassed shelf life and expiry dating Levothyroxine (T-4) is a naturally circulating thyroid hormone produced by the canine thyroid gland. Levothyroxine sodium provided by Thyro-Tabs® tablets cannot be distinguished from levothyroxine endogenously secreted from the dog's thyroid gland. Thyroid hormones influence virtually every body organ, either by their effect on growth and development or by the hormones' metabolic effects. Dosage and Administration: The initial recommended daily dose is 0.1 to 0.2 mg/10 pounds (4.5 kg) body weight in single or divided doses. Dosage is then adjusted by monitoring the T4 blood levels of the dog every four weeks until an adequate maintenance dose is established. The usual daily maintenance dose is 0.1 mg/10 lb (4.5 kg). A maximum of 0.8 to 1.0 mg total daily dose will be sufficient in most dogs over 80 pounds in body weight. Thyro-Tabs® may be administered orally or placed in the food. Active Ingredients: Levothyroxine Sodium Inactive Ingredients: Cellulose Microcrystalline, Sodium Starch Glycolate Type A Potato, Magnesium Stearate, Povidone K29 32, Calcium Phosphate Dibasic Dihydrate, Fd&c Yellow No. 6, D&c Yellow No. 10, Fd&c Red No. 40, Fd&c Blue No. 1, D&c Red No. 7, D&c Red No. 30, Fd&c Yellow No. 5 Warning: The administration of levothyroxine sodium to dogs to be used for breeding purposes or in pregnant bitches has not been evaluated. There is evidence to suggest that administration to pregnant bitches may in some instances affect the normal development of the thyroid gland in unborn pups. Caution: Federal law restricts this drug to use by or on the order of a licensed veterinarian. Low serum circulating L-thyroxine (T-4) concentrations, coupled with clinical signs, are suggestive of hypothyroidism. Based on studies conducted by LLOYD, Inc. and in cooperation with two commercial laboratories, the following parameters for T-4 concentrations in canine serum have been established: Normal (euthyroid) - 18 to 32 ng/mL (1.8 to 3.2 µg/dL) Possible hypothyroid - 10 to 18 ng/mL (1.0 to 1.8 µg/dL) Hypothyroid - less than 10 ng/mL ( 1.0 µg/dL). The animal should be showing some clinical signs associated with hypothyroidism. A resting serum T-4 concentration of 18 ng/mL or above signifies that hypothyroidism is unlikely in dogs. Normally, the greater the T-4 concentration exceeds this value, the less likely that a dog is hypothyroid. A dog with a T-4 value below 18 ng/mL that is exhibiting signs of hypothyroidism should be considered for levothyroxine replacement therapy. T-4 measurements should be made at 30 day intervals to establish the proper maintenance dose during a therapeutic trial with Thyro-Tabs® Caplets. A critical assessment of improvement in or resolution of clinical signs should be made after 12 weeks of levothyroxine sodium therapy. Further confirmation of the diagnosis could include withdrawal of the levothyroxine sodium therapy. A recurrence of clinical signs following cessation of therapy further supports the diagnosis. Correct diagnosis of hypothyroidism is important, since such a diagnosis normally commits an animal to life-long supplemental L-thyroxine replacement therapy. The principal objective of levothyroxine sodium administration is to achieve and maintain normal metabolism in the patient by providing an exogenous supply of synthetic L-thyroxine in amounts sufficient to maintain levels of the hormone within the animal’s normal physiologic range. Animal adaptation may necessitate regular monitoring of serum T-4 concentrations during the first several months of treatment to establish proper maintenance doses. The TSH Response Test may be used to provide a definitive diagnosis in dogs with borderline resting serum T-4 values. The TSH dose, post-dose sampling times, and interpretation of pre- and post-TSH injection responses depend somewhat on the reference laboratory used. Mode of actions: Levothyroxine sodium provided by Thyro-Tabs® Caplets cannot be distinguished from L-thyroxine endogenously secreted by the thyroid gland. L-thyroxine is a naturally circulating thyroid hormone released by the thyroid gland. The primary regulator of thyroid function is thyroid stimulating hormone (TSH) which is synthesized and secreted by the pars distalis of the adenohypophysis (anterior pituitary). The mediator from the hypothalamus which exerts a continuous influence over the pituitary release of TSH is thyrotropin-releasing hormone (TRH). Thyroid hormones influence virtually every body organ, either by their effect on growth and development or by the hormones’ metabolic effects. Occurrence of canine hypothyroidism: Hypothyroidism usually occurs in middle-aged and older dogs although the condition will sometimes be seen in younger dogs of the larger breeds. Neutered animals of either sex are also frequently affected, regardless of age. The condition is usually primary, failure of the thyroid gland, because of lymphocytic thyroiditis or other loss of follicular epithelium and resulting atrophy of the gland. Secondary hypothyroidism is relatively rare and usually due to a destructive pituitary tumor. Clinical signs of canine hypothyroidism: Not all dogs with hypothyroidism will have classical clinical signs and laboratory findings. The following list of clinical signs and laboratory findings may vary in dogs with hypothyroidism depending upon the degree and length of time of the thyroid dysfunction: Nerve and muscle function: lethargy, lack of endurance, increased sleeping, reduced alertness and interest, impaired cerebral function and dulled mental attitude, hypotonus, stiff and slow movements, dragging of forelimbs, head tilt, disturbed balance. Metabolism: decreased oxygen consumption and lower metabolic rate, sensitivity and intolerance to cold, low body temperature, cool skin, preference for warmth, increased body weight, constipation, poor exercise tolerance, slow heart rate, weak pulse, weak apex heart beat, and low voltage on ECG. Reproduction: reproductive failure, abortion, stillbirth, live birth of weak young, delayed puberty, reduced libido, impaired spermatogenesis, irregular estrus and anestrus, galactorrhea. Skin and hair: myxedema of face, blepharoptosis, atrophy of epidermis, thickening of dermis, surface and follicular hyperkeratosis, hyperpigmentation, coarse and sparse coat, dry, dull and brittle hair, slow regrowth and retarded turnover of hair, bilateral alopecia. Laboratory findings: low serum T-4 concentrations, hypercholesterolemia, hypertriglyceridemia, elevated serum creatine kinase, anemia (normochromic, normocytic). Contraindications: Levothyroxine sodium therapy is contraindicated in thyrotoxicosis, acute myocardial infarction, and uncorrected adrenal insufficiency. Other conditions in which the use of L-thyroxine replacement therapy may be contraindicated or should be instituted with caution include primary hypertension, euthyroidism, and pregnancy. Prescription items are NON-RETURNABLE and NON-REFUNDABLE.

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