Leventa 1mg/ml Oral Solution For Dogs 30ml

Leventa 1mg/ml Oral Solution For Dogs 30ml

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Item Number: LEVENTA 
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Unit Price:

£17.75 (Incl. Vat)

Usually despatched within 24-48 hours


NB This is a prescription only medicine
How do I buy Prescription medicines from you?

  1. Obtain a Prescription from your vet
  2. Place your order online or by phone
  3. Either fax email* or post your prescription to us.
  4. “Controlled Drugs” such as Epiphen or Tramadol can be only be dispensed ofter receipt of an original valid prescription sent by post. Controlled Drugs must be sent via tracked, signature delivery and do not qualify for free delivery.
  5. **Unless your vet has stated that the original must be sent to us.
  6. Choose your delivery method. Either Royal Mail Special Delivery which operates a next working day service, requiring a signature(Our recommended option). Or First class post which is free, but at your own risk, and is usually next working day but may take longer.
  7. Hyperdrug Pharmaceuticals Ltd, Middleton In Teesdale, Barnard Castle, County Durham, DL12 0NG.

You are ordering items which require a prescription, Tampering with a prescription or attempting to obtain extra unauthorise supplies is a criminal offence and will have to be reported to the authorities. “Controlled Drugs” such as Epiphen or Tramadol can be only be dispensed ofter receipt of an original valid prescription sent by post. Controlled Drugs are sent via tracked, signature delivery.

  1. Place your order online or by phone
  2. Obtain a Prescription from your vet
  3. Either post the original, fax it to 01833 641032, or email it to us at [email protected]

 I have a prescription on file
 I am sending you a prescription by email
 I am sending you a prescription by fax
 I am sending you a prescription by post


Clear, slight reddish coloured solution.

Each ml contains:
Active substance: Levothyroxine sodium (as multihydrate) 1 mg (equivalent to 0.97 mg levothyroxine).

Excipient: Ethanol 15% v/v.

Contra-indications, warnings, etc

Do not use in dogs with hyperthyroidism or uncorrected adrenal insufficiency (hypoadrenocorticism).

Do not use in case of hypersensitivity to levothyroxine sodium or to any of the excipients.

The product should be used with caution in dogs with cardiac disease, diabetes mellitus or treated adrenal insufficiency (hypoadrenocorticism). Levothyroxine therapy should be gradually introduced for these dogs. Start with 25% of the normal dose (5µg/kg once daily) and increase by 25% increments every two weeks until stabilised.

Adverse reactions associated with L-thyroxine sodium treatment are primarily those of hyperthyroidism, due to therapeutic overdose. They include weight loss, hyperactivity, tachycardia, polydipsia, polyuria, polyphagia, vomiting and diarrhoea. Transient, self-resolving skin reactions such as mild to moderate scale formation may occur.

Use in pregnancy

The safety of use in pregnant bitches, lactating bitches or animals intended for future breeding has not been evaluated. However, thyroxine is essential for normal foetal development. Hypothyroidism during pregnancy may be associated with impaired cognitive development and increased foetal mortality. During pregnancy, maternal thyroid hormone requirements may increase. Pregnant and lactating bitches receiving treatment should be monitored on a regular basis as dose requirements may change during pregnancy and lactation.

Use in lactating bitches or animals intended for future breeding has not been evaluated.

Drug interactions

L-thyroxine absorption may be impaired by the concurrent administration of antacids, e.g. aluminium or magnesium salts or calcium carbonate, or ferrous sulphate and sucralfate. Therefore, Leventa should not be administered within 2 hours of such products.

The therapeutic response to Leventa may be altered by compounds which influence thyroid hormone metabolism and disposition (e.g. drugs displacing protein-binding site, modifying serum thyroxine-binding globulin concentration, or altering hepatic degradation of thyroxine or peripheral conversion of thyroxine to tri-odothyronine). Thus, if Leventa is administered concurrently with a compound exhibiting such properties, thyroid hormone concentrations should be monitored and the dose of Leventa adjusted if needed.

Conversely, L-thyroxine supplementation may affect the pharmacokinetics and activity of concurrent therapies. In diabetic dogs treated with insulin, L-thyroxine supplementation may alter insulin requirements. In dogs with cardiac insufficiency, therapeutic response to cardiac glycosides may be decreased by L-thyroxine supplementation. Therefore, dogs receiving such products should be monitored carefully during initial treatment with Leventa.

Clinical signs of overdose with L-thyroxine are identical to those of hyperthyroidism and include body weight loss, hyperactivity, tachycardia, polydipsia, polyuria, polyphagia and diarrhoea. These signs are generally mild and fully reversible. Overdose may be accompanied by reversible changes in blood biochemistry, e.g. elevated glucose, inorganic phosphorus and albumin:globulin ratio, and reduced total protein and cholesterol.

Operator warnings

In the case of accidental ingestion, seek medical advice immediately and show the package leaflet or the label to the physician. Note: this product contains a high concentration of L-thyroxine sodium and may present a risk to humans if ingested.

Wash hands after use.

In case of eye contact, flush immediately with water.

Withdrawal periods

Not applicable.

For animal treatment only. Keep out of the reach and sight of children.

Pharmaceutical precautions

Store in a refrigerator (+2°C to +8°C). Store in the original container. Once opened use the product within 6 months.

Legal category


Packaging Quantities

30 ml amber glass bottle with a transparent LDPE insert and with a white HDPE child-resistant cap with tamper-proof closure in a printed carton.

A 1 ml oral syringe graduated in 0.05 ml increments is supplied with the product.

Pack sizes: 1 x 30 ml, 6 x 30 ml and 12 x 30 ml. Not all pack sizes may be marketed.

Further information

In a tolerance study, healthy dogs treated with Leventa at 40 µg/kg body weight once daily for 91 consecutive days did not present any adverse clinical signs. At dose rates of 120 and 200 µg/kg body weight, dogs did not exhibit signs other than those of hyperthyroidism, mainly weight loss. These signs were mild and reversible, with recovery occurring within 5 weeks after cessation of treatment.

In the event of an overdose standard measures should be taken to remove non-absorbed drug from the gastro-intestinal tract.

Marketing authorisation number

Vm 01708/4527.



Free shipping from Hyperdrug

Value Weight Delivery Charge*  
Over £49.00 Any Weight FREE*
Under £49.00 Under 250g £2.49
Under £49.00 No weight limit £4.99

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