vicks/vet RX at best will ONLY provide
symptomatic relief and do nothing whatsoever to actually TREAT what is causing the respiratory distress. (If its sinuses are plugged with crud then unplug them and do a sinus flush with sterile saline) and if you do choose to use this product (which has a very narrow therapeutic range which means you risk toxicity complications ) then you should be aware of the risk and especially vigilant for signs of toxicity.
http://www3.sympatico.ca/davehansen/avpoison.html
(A great overview of toxic substances to birds by pharmacologist Gillian A. Willis)
4.3 Camphor
Present in topical liniments and rubs. Toxicity: Stimulates central nervous system (CNS) to cause seizures. Toxic from all routes of absorption. A budgie developed seizures as a result of skin absorption, vapour inhalation and ingestion when the owner handled it after using Campho-phenique without washing his hands."
http://www.emea.europa.eu/pdfs/vet/mrls/068499en.pdf
COMMITTEE FOR VETERINARY MEDICINAL PRODUCTS
"... camphor, due to its lipophilic character, is generally considered to be
rapidly absorbed in significant amounts through mucous membranes and intact skin. Metabolism is by hydroxylation and conjugation of the substance with glucuronic acid. Camphor and its metabolites are excreted mainly via urine.
Camphor is acutely toxic and the therapeutic range is considered narrow. The reported human lethal dose is 15 to 500 mg/kg bw. Infants are most vulnerable because of lower activity of liver enzymes able to hydroxylate and conjugate camphor with glucuronic acid. Acute camphor
ingestion may lead to neonatal toxicity because camphor crosses the placenta.
Symptoms of camphor poisoning are hepatotoxicity and neurotoxic effects presenting as confusion, respiratory dysregulation and tonic-clonic convulsions...."