Cialis (tadalafil) facts. Cialis is the trade name for a drug called Tadalafil. Cialis is one of a class of drugs known as PDE-5 (Phosphodiesterase type 5) inhibitors. Cialis and the other PDE-5 inhibitors can help men with erectile dysfunction (male impotence) by enhancing the erectile response when a man is sexually stimulated. Aside from Cialis, the other drugs in this class are Viagra (Sildenafil) and Levitra (Vardenafil).
This section shows a full list of all the diseases and conditions listed as a possible cause of Excessive yawning in our database from various sources. 1  Aortic dissection. 2  Excessive daytime sleepiness. 3  Heart attack.  Sleep apnea.
1 Parasites - My husband's horse has neck threadworms that have travelled to the eyes. This horse sometimes yawns more often when the parasites are active in the spring. We have no Equine Parasites scientific proof, but this has been our observation.  Eating stemmy hay or soaked pellets seems to cause some horses to yawn.