The concurrent use of isotretinoin with tetracycline antibiotics or vitamin A supplementation is not recommended.

Abortions in domestic ruminants have been associated with concurrent use of anti-trematode therapeutic agents.

For a period of 170 years (1582-1752), both dating systems were in concurrent use in different parts of Western Europe and its colonies.

The techniques of mutual exclusion are used to prevent this concurrent use.

The risk is high in concurrent use of ACE inhibitors or spironolactone.

The concurrent use of potentiated sulfonamide antibiotics is considered particularly dangerous.

(8) The length of time during and conditions under which there has been concurrent use without evidence of actual confusion.

Furthermore, the concurrent use of tetracyclines and methoxyflurane has been reported to result in fatal renal toxicity.

Fairbairn's observations led him to develop a revolutionary rowing style featuring concurrent use of the legs, back and arms at the catch.